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ASP.NET Hosting - ASPHostPortal.com :: Easy to Design Pie Chart and Donut Chart in ASP.NET

clock September 28, 2015 12:40 by author Kenny

Easy to Design Pie Chart and Donut Chart in ASP.NET

D3.js stands for Data-Driven Document. It is a JavaScript library using which we can manipulate documents based on data. The data can be fetched using multiple ways like Web Services, WCF Services, REST APIs or the relatively new Microsoft ASP.NET Web API amongst many others. Using D3, you can bind the data to the Document Object Model (DOM) and present that data with rich visualizations. D3 internally makes use of CSS, HTML and SVG capabilities to make your data presentable. It is powerful, fast and supports large datasets and dynamic behaviors for interactions and powerful and smooth animations.

D3.js provides easy and declarative selections of DOM nodes using W3C Selector APIs. D3 Selector APIs provides number of methods to manipulate nodes. For example –

  • Setting attributes and applying rich styles
  • Registering Event Listeners
  • You can add, remove and sort DOM nodes
  • You can change the HTML or the text contents of HTML elements
  • You can also have a direct selection/access to the DOM as each selection is an array of nodes

Likewise, we have various features of D3.js selectors which we can use to present data to our DOM nodes.

A simple selector example is the following:

var bodySelection = d3.select('body').style('background-color', 'blue');

In the above example, we are selecting body and changing its background color to blue. Another example would be as follows:

var divSelection = d3.selectAll('div').style('background-color', 'yellow');

In the above example, we are selecting all divs and changing its background color to yellow. If you are familiar with jQuery, the syntax looks similar to jQuery selectors or HTML5 Selectors.

D3 allows us to bind the data to the DOM elements and their attributes using a Data method which takes an array. For example:

d3.selectAll("div")
  .data([200,300,400,100])
  .style("height", function (data) { return data + "px"; });

In the above example, we are selecting all the div’s on the page and based on the index, the first value of an array will be passed to first div, second value to second div and so on.

In D3, you can also make use of Enter and Exit selector methods to create new nodes for incoming data, and remove outing nodes that are no longer used.

You can also apply transitions to nodes using D3. For example –

var area = d3.select('body')
            .append('svg')
            .attr('width', 500)
            .attr('height', 500);
 
var circle = area.append('rect')
                 .attr('width', 100)
                 .attr('height', 100)
                 .attr('fill', 'red');
 
circle.transition()
      .duration(2000)
      .delay(2000)
      .attr('width', 400)
      .each('start', function () {
            d3.select(this).attr('fill', 'green');})
      .transition()
      .duration(2000)
      .attr('height', 400)
      .transition()
      .duration(2000)
      .attr('width', 50)
      .transition()
      .duration(2000)
      .attr('height', 50)
      .each('end', function () {
            d3.select(this).attr('fill', 'blue'); });

In the above example, we are drawing a Rectangle and applying the transition to the same. Likewise, we can make use of various features of D3.js to present our data using rich visualizations.

A Quick overview of ASP.NET Web API

REST(REpresentational State Transfer) has emerged as the prominent way to create web services. By using REST we can build loose coupled services with data available on the web over HTTP protocol.

ASP.NET Web API is a platform for building RESTful applications. ASP.NET Web API is a framework using which we can build HTTP Services which can be called from a broad range of clients, browsers and mobile devices. ASP.NET Web API is the defacto standard of creating web services and replaces WCF.

When we think about exposing data on the web, we usually talk about four common operations which we use on a daily basis in our apps – CREATE, RETRIVE, UPDATE, DELETE.

We call these operations as CRUD operations. REST provides 4 basic HTTP verbs which we can map to our CRUD operations as described here - POST – CREATE, GET – RETRIVE, PUT – UPDATE, DELETE – DELETE.

By using REST, if you can connect to the web, any application can consume your data. When the data is pulled or pushed by using REST, the data is always serialized into or de-serialized from JSON or XML.

Setting up the application and ASP.NET Web API

To start designing the Pie chart and Donut chart, use the following tools and technologies:

  • Microsoft Visual Studio 2013 (Express or Professional)
  • Microsoft SQL Server 2012 (Express or Developer)
  • jQuery
  • D3.js
  • ASP.NET WEB API

Let’s first design the table where we can add our data. To design the table, open SQL Server Management Studio and write the following script:

CREATE TABLE [dbo].[CityPopulationTable](
    [CityID] [int] IDENTITY PRIMARY KEY,
    [CityName] [nvarchar](30) NULL,
    [Population] [int] NULL
)

Create an ASP.NET Web application by choosing Web Forms template. Then add the Entity Framework, jQuery and D3.js libraries into our web application using NuGet.

Once you add these libraries, right click on the Models folder in our Web application under Solution Explorer, and click on Add New Item. Choose Data  > ADO.NET Entity Data Model.

Using Entity Data Model Wizard, connect to our database and choose CityPopulationTable.

It’s time to implement the ASP.NET Web API into our project. Right click the web application and add a new folder with the name Controllers.

After adding the Web API, open Global.asax file and import two namespaces as shown here:

using System.Web.Http;
using System.Web.Routing;

Also add the following code to the Application_Start method –

GlobalConfiguration.Configure(WebApiConfig.Register);

The above line registers the Web API route in our web application. Now under App_Start folder, you will find WebApiConfig.cs file. Open this file and write the following code:

public static void Register(HttpConfiguration config)
{
    config.MapHttpAttributeRoutes();
 
    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );
    var json = config.Formatters.JsonFormatter;
    json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
    json.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    config.Formatters.Remove(config.Formatters.XmlFormatter);
}

In the above code, we are configuring Web API to make use of JSON formatter with camel casing, as most of the JavaScript developer will expect JSON output in Camel casing.

Now modify the Get method of our Web API controller as shown here:

public class PieChartController : ApiController
{
    NorthwindEntities dataContext = new NorthwindEntities();
    // GET api/piechart
    public IEnumerable<CityPopulationTable> Get()
    {
        return dataContext.CityPopulationTables.ToList();
    }
}

In the above code, we have created an object of our Entity Data model which will give access to the tables. Then we are returning an IEnumerable of our object CityPopulationTables.

Let us design our Pie chart and Donut chart using the Web API data shown in above:

Creating D3 Charts

Add a HTML page with the name ‘CityPolulationPieChart.html’. Once you add the page, we will reference the jQuery and D3.js file in the page:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Pie Chart Example</title>
    <script src="Scripts/jquery-1.10.2.js"></script>
    <script src="Scripts/d3.js"></script>
</head>

We will make use of jQuery AJAX function to fetch the data from our Web API and display it in a Pie and Donut chart. Let’s add a DOM ready function into our <body> tag. In this function, we will first declare two arrays. First array will hold the data for our chart and the second array will hold the colors which we will use for our chart:

$(function () {
            var chartData = [];
            var colors = [];
});

In the next step, we will fetch the data from our Web API using jQuery $.ajax function. Add this code after our array declaration:

$.ajax({
        type: "GET",
        url: "api/PieChart",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (result) {
            $.each(result, function (i,j) {
                chartData.push(j.population);
                var currentColor = '#' + Math.floor(Math.random() * j.population+5566656).toString(16);
                colors.push(currentColor);
            });
            console.log(chartData);}
        error: function (msg) {
            $("#result").text(msg);
        }
});

Note: Although I have used success and error here for devs using an older version of jQuery, these methods have been deprecated from jQuery 1.8. You should replace them with .done() and fail().

In the above code, we are using a GET request with the Web API URL and the type of data set to JSON. On successful completion of the request, we are running a loop using $.each() which will push the fetched data into our chartData array. We are also generating colors and adding them into our colors array.

Now it’s time to use the D3 selector. We will use D3 selector to select the body and will append the SVG element to the same by setting its height and width. Add this code after console.log function. The code is shown below –

var radius = 300;
var colorScale = d3.scale.ordinal().range(colors);
                    
var area = d3.select('body').append('svg')
             .attr('width', 1500)
             .attr('height', 1500);

Also note that we are using the scale function of D3 which allows us to set the ordinal scale with the range to set the scale’s output range. We have also added a variable called radius which is set to 300.

The next step is to group the elements and draw an arc into our SVG as shown in the following code:

var pieGroup = area.append('g').attr('transform', 'translate(300, 300)');
var arc = d3.svg.arc()
                .innerRadius(0)
                .outerRadius(radius);

In the above code, we are using radius variable as the outer radius and fixing the inner radius to 0. As the next step, use a pie layout available under D3. Then pass the chart data and append it to our group ‘g’. The code is shown below –

var pie = d3.layout.pie()
       .value(function (data) { return data; })
var arcs = pieGroup.selectAll('.arc')
       .data(pie(chartData))
       .enter()
       .append('g')
       .attr('class', 'arc');

Also observe, we are using D3 selector to select arc class added at the end, which will select all the elements which has a class arc. In the last step,  append the path and fill the color from our array. We will also display the population data as text to our pie chart. The code is shown below –

arcs.append('path')
    .attr('d', arc)
    .attr('fill', function (d) { return colorScale(d.data); });
 
arcs.append('text')
    .attr('transform', function (data) { return 'translate(' + arc.centroid(data) + ')'; })
    .attr('text-anchor', 'middle')
    .attr('font-size', '1em')
    .text(function (data) { return data.data; });

Donut Chart

Designing a Donut chart is very simple. Just change the inner radius to something higher than zero. I am making it 200. The code is as shown here:

var arc = d3.svg.arc()
        .innerRadius(200)
        .outerRadius(radius);

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ASP.NET MVC 6 Hosting - ASPHostPortal :: Remote Validation in ASP.NET MVC

clock August 24, 2015 08:07 by author Kenny

Remote Validation in ASP.NET MVC

ASP.NET is an open-source server-side Web application framework designed for Web development to produce dynamic Web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services. ASP.NET MVC gives you a powerful, patterns-based way to build dynamic websites that enables a clean separation of concerns and that gives you full control over markup. Remote validation is used to make server calls to validate data without posting the entire form to the server when server side validation is preferable to client side.  It's all done set up model and controller which is pretty neat. 

Using the Code

To implement remote validation in an application we have two scenarios, one is without an additional parameter and the other is with an additional parameter. First we create an example without an additional parameter. In this example we check whether a username exists or not. If the username exists then that means the input user name is not valid. We create a view model class "UserViewModel" under the Models folder and that code is:

using System.Web.Mvc;  
namespace RemoteValidation.Models   
{  
    public class UserViewModel   
    {  
        public string UserName   
        {  
            get;  
            set;  
        }  
        public string Email   
        {  
            get;  
            set;  
        }  
    }  
}

 

Now we create a static data source, in other words we create a static list of UserViewModel in which we could check whether a username exists or not. You can also use the database rather than a static list. The following code snippet is for StaticData.

using RemoteValidation.Models;  
using System.Collections.Generic;  
 
namespace RemoteValidation.Code   
{  
    public static class StaticData   
    {  
        public static List < UserViewModel > UserList   
        {  
            get {  
                return new List < UserViewModel >   
                {  
                    new UserViewModel   
                    {  
                        UserName = "User1", Email = "[email protected]"  
                    },  
                    new UserViewModel   
                    {  
                        UserName = "User2", Email = "[email protected]"  
                    }  
                }  
            }  
        }  
    }  

 

Now we create a controller "ValidationController" in which we create an action method to check whether a user name exists or not and return a result as a JSON format. If the username exists then it returns false so that the validation is implemented on the input field. The following code snippet shows ValidationController under the Controllers folder.

using RemoteValidation.Code;  
using System.Linq;  
using System.Web.Mvc;  
 
namespace RemoteValidation.Controllers   
{  
    public class ValidationController: Controller   
    {  
        [HttpGet]  
        public JsonResult IsUserNameExist(string userName)   
        {  
            bool isExist = StaticData.UserList.Where(u = > u.UserName.ToLowerInvariant().Equals(userName.ToLower())).FirstOrDefault() != null;  
            return Json(!isExist, JsonRequestBehavior.AllowGet);  
        }  
    }  
}

 

Now we add remote validation on the UserName of the UserViewModel property as in the following code snippet.

using System.Web.Mvc;  
 
namespace RemoteValidation.Models   
{  
    public class UserViewModel   
    {  
        [Remote("IsUserNameExist", "Validation", ErrorMessage = "User name already exist")]  
        public string UserName   
        {  
            get;  
            set;  
        }  
        public string Email   
        {  
            get;  
            set;  
        }  
    }  

 

As in the preceding code snippet, the IsUserNameExist is a method of ValidationController that is called on the blur of an input field using a GET request. Now we create UserController under the Controllers folder to render a view on the UI.

using RemoteValidation.Models;  
using System.Web.Mvc;  
 
namespace RemoteValidation.Controllers   
{  
    public class UserController: Controller   
    {  
        [HttpGet]  
        public ActionResult AddUser()   
        {  
            UserViewModel model = new UserViewModel();  
            return View(model);  
        }  
    }  

Now we add jquery.validate.js and jquery.validate.unobtrusive.js to the project and create a bundle as in the following code snippet.

using System.Web.Optimization;  
 
namespace RemoteValidation.App_Start   
{  
    public class BundleConfig   
    {  
        public static void RegisterBundles(BundleCollection bundles)   
        {  
            bundles.Add(new StyleBundle("~/Content/css").Include(  
                "~/Content/css/bootstrap.css",  
                "~/Content/css/font-awesome.css",  
                "~/Content/css/site.css"));  
 
            bundles.Add(new ScriptBundle("~/bundles/jquery").Include(  
                "~/Scripts/jquery-{version}.js"));  
 
            bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(  
                "~/Scripts/jquery.validate*"));  
        }  
    }  

Thereafter we add the following keys in the web.config file.

<add key="ClientValidationEnabled" value="true" />   
<add key="UnobtrusiveJavaScriptEnabled" value="true" />  
 
 

Thereafter we create a view for the AddUser action method. The following code snippet is for the AddUser view.

@model RemoteValidation.Models.UserViewModel  
 
< div class = "panel panel-primary" > < div class = "panel-heading panel-head" > Add User < /div>    
    <div class="panel-body">    
        @using (Html.BeginForm())    
        {    
            <div class="form-horizontal">    
                <div class="form-group">    
                    @Html.LabelFor(model => model.UserName, new { @class = "col-lg-2 control-label" })    
                    <div class="col-lg-9">    
                        @Html.TextBoxFor(model => model.UserName, new { @class = "form-control" })    
                        @Html.ValidationMessageFor(model => model.UserName)    
                    </div > < /div>    
                <div class="form-group">    
                    @Html.LabelFor(model => model.Email, new { @class = "col-lg-2 control-label" })    
                    <div class="col-lg-9">    
                        @Html.TextBoxFor(model => model.Email, new { @class = "form-control" })    
                        @Html.ValidationMessageFor(model => model.Email)    
                    </div > < /div>                    
                <div class="form-group">    
                    <div class="col-lg-9"></div > < div class = "col-lg-3" > < button class = "btn btn-success"  
                     id = "btnSubmit"  
                     type = "submit" > Submit < /button>    
                    </div >
               < /div>    
            </div >  
} < /div>    
</div >   
@section scripts   
{  
    @Scripts.Render("~/bundles/jqueryval")  

Let's run the application and put values into the user name field to execute the remote validation as in the following image.

Figure 1: Remote validation on user name


Now we move to another option, we pass an additional parameter in the remote validation. We pass both the user name and email as a parameter and check whether the username and email combination exist or not on the email input. That's why we add one more method in ValidationController as in the following code snippet for it.

[HttpGet]  
public JsonResult IsUserExist(string email, string userName)   
{  
    bool isExist = StaticData.UserList.Where(u = > u.UserName.ToLowerInvariant().Equals(userName.ToLower()) && u.Email.ToLowerInvariant().Equals(email.ToLower())).FirstOrDefault() != null;  
    return Json(!isExist, JsonRequestBehavior.AllowGet);  

Now we call this method on the Email property of UserViewModel as in the following code snippet.

using System.Web.Mvc;  
 
namespace RemoteValidation.Models   
{  
    public class UserViewModel   
    {  
        [Remote("IsUserNameExist", "Validation", ErrorMessage = "User name already exist")]  
        public string UserName   
        {  
            get;  
            set;  
        }  
        [Remote("IsUserExist", "Validation", ErrorMessage = "User already exist", AdditionalFields = "UserName")]  
        public string Email   
        {  
            get;  
            set;  
        }  
    }  
}

As in the preceding code snippet, we are passing an additional field using AdditionalFields in Remote. If we must pass more than one parameter then these will be comma-separated. Now run the application and the result will be as shown in the following image.  



ASP.NET Hosting - ASPHostPortal.com :: Solving Cannot Attach The File '.mdf' as Database in MVC

clock May 28, 2015 06:44 by author Dan

While doing database update using code-first migrations in ASP.Net MVC, came across the strange exception and details are as follows,

Issue back ground details,
1. Manually deleted auto created ".mdf" file from App_Data folder using Visual Studio.
2. Executed update-database in package manager console. Then got the below exception,

System.Data.SqlClient.SqlException (0x80131904): Cannot attach the file 'E:\Backup\Practice\MVC4\DotNetExamples\DotNetExamples\App_Data\DotnetExamples.mdf' as database 'DotnetExamples'.

at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)

at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)

at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)

at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)

at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)

at System.Data.SqlClient.SqlConnection.Open()

at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements)

at System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable`1 migrationStatements)

at System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, XDocument targetModel, IEnumerable`1 operations, Boolean downgrading, Boolean auto)

at System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)

at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ApplyMigration(DbMigration migration, DbMigration lastMigration)

at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)

at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)

at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)

at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)

at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()

at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()

ClientConnectionId:7c44a645-a831-418e-b8e6-88232006e97a

 
No clue about this, how to resolve and after spending lot of time searching on web, came across the following solution. Keeping this for my future reference and it might help for others for same type of problem,

Solution:

If you delete the DB file, it still stays registered with SqlLocalDB. Sometimes it fixes it by deleting DB. We can do this from the command line.

Open the "Developer Command Propmpt for VisualStudio" under your "Start/Programs menu->All Programs->Visual Studio 2012->Visual Studio Tools"

    Run the following commands:

    sqllocaldb.exe stop v11.0

    sqllocaldb.exe delete v11.0


Now execute "update-database" command from package manager console and it will create database for you without any obstacles.

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ASP.NET MVC Hosting - ASPHostPortal.com :: How to Structure The Application in ASP.NET MVC Areas

clock November 25, 2014 05:11 by author Ben

This week I discovered a difficulty related to structuring an ASP.NET MVC web applications one advancement crew was dealing with. The things they have been trying to do was quite straightforward: to create a folder framework each having their particular subfolders for View/Controller/Scripts/CSS and so on. The appliance assets like JS/CSS etc. were not getting rendered properly. The difficulty was owing to NET.config file lying underneath the subfolder, which when moved to the Views folder below that subfolder things went good. The purpose of this post just isn't to debate regarding the specifics of that difficulty and it is solution.But to discuss regarding how we will very easily framework our ASP.NET MVC Web application as per distinct modules, which is an clear need for just about any big application.


ASP.NET MVC follows the paradigm of “Convention Over Configuration” and default folder structure and naming conventions operates good to get a smaller sized software. But for relatively bigger a single there is a necessity to customise.The framework also offers adequate provisions for the same.You'll be able to have your personal controller manufacturing facility to get custom methods to making the controller classes and custom see engine for finding the rendering the sights. But when the necessity would be to structure the applying to distinct subfolders as per modules or subsites I believe using “Area” in ASP.NET MVC will likely be useful to make a streamlined software.

You can add a area to some ASP.NET MVC undertaking in Visual Studio as shown beneath.

Here I have added an area named “Sales”. As shown in the figure below a folder named “Areas” is created with a subfolder “Sales”. Under “Sales” we can see the following

  • The standard folder of Models/Views/Controllers
    • A Web.config under the Views folder. This contains the necessary entries for the RazorViewEngine to function properly
  • A class named SalesAreaRegistration.

The code (auto generated) for the SalesAreaRegistration class is shown below:

public class SalesAreaRegistration : AreaRegistration
{
    public override string AreaName
    {
        get
        {
            return "Sales";
        }
    }
 
    public override void RegisterArea(AreaRegistrationContext context)
    {
        context.MapRoute(
            "Sales_default",
            "Sales/{controller}/{action}/{id}",
            new { action = "Index", id = UrlParameter.Optional }
        );
    }
}

System.Web.Mvc.AreaRegistration may be the summary base class use registering the places to the ASP.NET MVC Web Application. The method void RegisterArea(AreaRegistrationContext context) must be overriden to sign up the realm by providing the route mappings. The class System.Web.Mvc.AreaRegistrationContext encapsulates the mandatory information (like Routes) required to sign-up the area.

In Global.asax.cs Application_Start occasion we must RegisterAllAreas() technique as demonstrated under:

AreaRegistration.RegisterAllAreas();

The RegisterAllAreas method looks for all types deriving from AreaRegistration and invokes their RegisterArea method to register the Areas.

Now with the necessary infrastructure code in place I have added a HomeController and Index page for the “Sales” area as shown below.

I have to change the Route Registration for the HomeController to avoid conflicts and provide the namespace information as shown below:

public static void RegisterRoutes(RouteCollection routes)
{
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
 
            routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional },// Parameter defaults
                new String[] { "AreasDemo.Controllers" }
            );
}

Now I will add a link to the Sales area by modifying the _Layout.cshtml as shown below:

<li>@Html.ActionLink("Sales", "Index", "Home", new { area="Sales"},null)</li>

Here I am navigating to the area “Sales” from the main application so I have to provide area information with routeValues. The following overload is being used in the code above:

public static MvcHtmlString ActionLink(this HtmlHelper htmlHelper, string linkText, string actionName, string controllerName, object routeValues, object htmlAttributes);



ASP.NET 4.5 HOSTING - ASPHostPortal :: How to Export Data from SQL Server to Excel in ASP.net using c#

clock November 24, 2014 06:26 by author Mark

Introduction:

Here I will explain how to export data from sql server to excel in asp.net using c# or export data from sql server database to excel in asp.net using c#.

Description:

Now I will explain to you, how to export data from sql server to excel in asp.net using c#.
Before implement this example first design one table UserInformation in your database as shown below
Once table created in database enter some dummy data to test application after that write the following code in your aspx page

Column Name

Data Type

Allow Nulls

UserId

int

Yes

UserName

varchar(50)

Yes

Location

varchar(50)

Yes

<html xmlns="http://www.w3.org/1999/xhtml">
  <head runat="server">
    <title>Export data from sql server database to excel in asp.net using c#</title>
  </head>
      <body>
      <form id="form1" runat="server">
         <div>
            <asp:Button ID="btnExport" Text="Export Data" runat="server" onclick="btnExport_Click" />
         </div>
       </form>

      </body>
</html>

Now open code behind file and write the following code :  

using System;
using System.Data;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void btnExport_Click(object sender, EventArgs e)
    {
        Response.ClearContent();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "Customers.xls"));
        Response.ContentType = "application/ms-excel";
        DataTable dt = GetDatafromDatabase();
        string str = string.Empty;
        foreach (DataColumn dtcol in dt.Columns)
        {
            Response.Write(str + dtcol.ColumnName);
            str = "\t";
        }
        Response.Write("\n");
        foreach (DataRow dr in dt.Rows)
        {
            str = "";
            for (int j = 0; j < dt.Columns.Count; j++)
            {
                Response.Write(str + Convert.ToString(dr[j]));
                str = "\t";
            }
            Response.Write("\n");
        }
        Response.End();
    }
    protected DataTable GetDatafromDatabase()
    {
        DataTable dt = new DataTable();
        using (SqlConnection con = new SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB"))
        {
            con.Open();
            SqlCommand cmd = new SqlCommand("Select TOP 10 UserName,LastName,Location FROM UserInformation", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(dt);
            con.Close();
        }
        return dt;
    }
}

VB.NET
Imports System.Data
Imports System.Data.SqlClient
Partial Class VBCode
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    End Sub
    Protected Sub btnExport_Click(ByVal sender As Object, ByVal e As EventArgs)
        Response.ClearContent()
        Response.Buffer = True
        Response.AddHeader("content-disposition", String.Format("attachment; filename={0}", "Customers.xls"))
        Response.ContentType = "application/ms-excel"
        Dim dt As DataTable = GetDatafromDatabase()
        Dim str As String = String.Empty
        For Each dtcol As DataColumn In dt.Columns
            Response.Write(str + dtcol.ColumnName)
            str = vbTab
        Next
        Response.Write(vbLf)
        For Each dr As DataRow In dt.Rows
            str = ""
            For j As Integer = 0 To dt.Columns.Count - 1
                Response.Write(str & Convert.ToString(dr(j)))
                str = vbTab
            Next
            Response.Write(vbLf)
        Next
        Response.[End]()
    End Sub
    Protected Function GetDatafromDatabase() As DataTable
        Dim dt As New DataTable()
        Using con As New SqlConnection("Data Source=SureshDasari;Integrated Security=true;Initial Catalog=MySampleDB")
            con.Open()
            Dim cmd As New SqlCommand("Select TOP 10 UserName,LastName,Location FROM UserInformation", con)
            Dim da As New SqlDataAdapter(cmd)
            da.Fill(dt)
            con.Close()
        End Using
        Return dt
    End Function
End Class



ASP.NET 4.5 HOSTING - ASPHostPortal :: How to Create Nested WebGrid in ASP.NET MVC6.

clock November 19, 2014 05:51 by author Mark

How to Create Nested WebGrid with Expand/Collapse in ASP.NET MVC6.

Introduction

In this post, I am explain How to Create Nested WebGrid with Expand/Collapse in ASP.NET MVC6.
Steps :

Step - 1 : Create New Project.

  • Go to File > New > Project > Select asp.net MVC6 web application > Entry Application Name > Click OK > Select Internet Application > Select view engine Razor > OK

Step-2: Add a Database.

  • Go to Solution Explorer > Right Click on App_Data folder > Add > New item > Select SQL Server Database Under Data > Enter Database name > Add.

Step-3: Create table for fetch data.

  • Open Database > Right Click on Table > Add New Table > Add Columns > Save > Enter table name > OK.

In this example, I have used two tables as below

Step-4: Add Entity Data Model.

  • Go to Solution Explorer > Right Click on Project name form Solution Explorer > Add > New item > Select ADO.net Entity Data Model under data > Enter model name > Add.
  • A popup window will come (Entity Data Model Wizard) > Select Generate from database > Next >
  • Chose your data connection > select your database > next > Select tables > enter Model Namespace > Finish.

Step-5: Add a class for create a view model.

  • 1st : Add a folder.
  • Go to Solution Explorer > Right Click on the project > add > new folder.
  • 2nd : Add a class on that folder
  • Go to Solution Explorer > Right Click on that folder > Add > Class... > Enter Class name > Add.

Write the following code in this class

using System.Collections.Generic;
namespace MVCNestedWebgrid.ViewModel
{
    public class OrderVM
    {
        public OrderMaster order { get; set; }
        public List<OrderDetail> orderDetails { get; set; }
    }
}

Step-6: Add a new Controller.

  • Go to Solution Explorer > Right Click on Controllers folder form Solution Explorer > Add > Controller > Enter Controller name > Select Templete "empty MVC Controller"> Add.

Step-7: Add new action into your controller for show nested data in a webgrid.

Here I have added "List" Action into "Order" Controller. Please write this following code

public ActionResult List()
{
    List<OrderVM> allOrder = new List<OrderVM>();
 
    // here MyDatabaseEntities is our data context
    using (MyDatabaseEntities dc = new MyDatabaseEntities())
    {
        var o = dc.OrderMasters.OrderByDescending(a => a.OrderID);
        foreach (var i in o)
        {
            var od = dc.OrderDetails.Where(a => a.OrderID.Equals(i.OrderID)).ToList();
            allOrder.Add(new OrderVM { order= i, orderDetails = od });
        }
    }
    return View(allOrder);
}

Step-8: Add view for the Action & design.

  • Right Click on Action Method (here right click on form action) > Add View... > Enter View Name > Select View Engine (Razor) > Check "Create a strong-typed view" > Select your model class > Add.

NOTE " Please Rebuild solution before add view

Html Code
@model IEnumerable<MVCNestedWebgrid.ViewModel.OrderVM>

@{
    ViewBag.Title = "Order List";
    WebGrid grid = new WebGrid(source: Model, canSort: false);
}
<div id="main" style="padding:25px; background-color:white;">
    @grid.GetHtml(
    htmlAttributes: new {id="gridT", width="700px" },
    columns:grid.Columns(
            grid.Column("order.OrderID","Order ID"),
            grid.Column(header:"Order Date",format:(item)=> string.Format("{0:dd-MM-yyyy}",item.order.OrderDate)),
            grid.Column("order.CustomerName","Customer Name"),
            grid.Column("order.CustomerAddress","Address"),
            grid.Column(format:(item)=>{
                WebGrid subGrid = new WebGrid(source: item.orderDetails);
                return subGrid.GetHtml(
                    htmlAttributes: new { id="subT" },
                    columns:subGrid.Columns(
                            subGrid.Column("Product","Product"),
                            subGrid.Column("Quantity", "Quantity"),
                            subGrid.Column("Rate", "Rate"),
                            subGrid.Column("Amount", "Amount")
                        )                   
                    );
            })
        )
    )
</div>
Css Code
<style>
th, td {
        padding:5px;
    }
    th
    {
        background-color:rgb(248, 248, 248);       
    }
    #gridT,  #gridT tr {
        border:1px solid #0D857B;
    }
    #subT,#subT tr {
        border:1px solid #f3f3f3;
    }
    #subT {
        margin:0px 0px 0px 10px;
        padding:5px;
        width:95%;
    }
    #subT th {
        font-size:12px;
    }
    .hoverEff {
        cursor:pointer;
    }
    .hoverEff:hover {
        background-color:rgb(248, 242, 242);
    }
    .expand {
        background-image: url(/Images/pm.png);
        background-position-x: -22px;
        background-repeat:no-repeat;
    }
    .collapse  {
        background-image: url(/Images/pm.png);
        background-position-x: -2px;
        background-repeat:no-repeat;
    }
</style>
Write the following Jquery code for make webgrid collapsible
<script>
    $(document).ready(function () {
        var size = $("#main #gridT > thead > tr >th").size(); // get total column
        $("#main #gridT > thead > tr >th").last().remove(); // remove last column
        $("#main #gridT > thead > tr").prepend("<th></th>"); // add one column at first for collapsible column
        $("#main #gridT > tbody > tr").each(function (i, el) {
            $(this).prepend(
                    $("<td></td>")
                    .addClass("expand")
                    .addClass("hoverEff")
                    .attr('title',"click for show/hide")
                );
            //Now get sub table from last column and add this to the next new added row
            var table = $("table", this).parent().html();
            //add new row with this subtable
            $(this).after("<tr><td></td><td style='padding:5px; margin:0px;' colspan='" + (size - 1) + "'>" + table + "</td></tr>");
            $("table", this).parent().remove();
            // ADD CLICK EVENT FOR MAKE COLLAPSIBLE
            $(".hoverEff", this).live("click", function () {
                $(this).parent().closest("tr").next().slideToggle(100);
                $(this).toggleClass("expand collapse");
            });
        });
        //by default make all subgrid in collapse mode
        $("#main #gridT > tbody > tr td.expand").each(function (i, el) {
            $(this).toggleClass("expand collapse");
            $(this).parent().closest("tr").next().slideToggle(100);
        });    
    });
</script>



ASP.NET 4.5.1 Hosting with ASPHostPortal.com :: How to Increase The Overall Performance of ASP.NET 4.5.1 in your App

clock October 1, 2014 07:23 by author Ben

ASP.NET is really a framework for creating net applications created by Microsoft. Initially the technologies. NET is the successor of ASP which is also a computer software product from Microsoft. With .NET ASP gives a platform for developers to design and create dynamic websites and net portals.



You will find certain items that ought to be regarded as when improving the performance from the application in developing a net application. Here are a few of the tips to improve the performance of ASP.NET 4.5.1:

Turn off Session State
Disable session state if you do not need, as this can improve the all round efficiency. By default the session state is always active. However, you'll be able to disable session state for any specific pages.

Turn off Tracing
If tracing is enabled, tracing will add a whole lot of overhead in producing applications. Though tracing is actually a useful function inside the development because it enables developers to track and trace application sequence, tracing may be turned off, unless you want to monitor the trace logging.

Avoid Page Validation Server (Steer clear of Server-side Validation)
Within this case, must be attempted use of client-side validation, not the server side. Server-side validation will consume a lot of sources around the server which can have an effect on application efficiency.

Stay away from Exceptions (Avoid Exceptions)
Exceptions may be 1 of the biggest resource eater which resulted within the lower of web applications and windows applications. Therefore, it is much better to prevent the use and handling of exceptions which can be not beneficial.

Avoid frequent connections for the database (Steer clear of Frequent Calls to Database)
Connections are frequently made for the database can devote time response and resources (resources). This can be avoided by utilizing batch processing. Producing the minimum database connection as a connection is opened and not closed, may cause efficiency slowdown.

Stay away from utilizing Recursive Functions and Nested Loops
To improve application performance, attempt to always steer clear of utilizing nested loops and recursive functions simply because these functions consume a whole lot of memory.

Turn off the View State

In ASP.NET, the default view state will probably be active and will slow down the website. So if you don't use a kind postback, it's much better to disable view state.

Use Caching
Web page caching could be employed to get a particular period of time and towards the required duration will not visit the server and are served from the cache. In the case of static internet pages and dynamic, Partial Caching [Fragment Caching] may be utilized to break into a couple of pages a user control.



ASP.NET 4.5.2 Hosting with ASPHostPortal.com :: Responsive Layout Using Bootstrap in ASP.NET

clock September 22, 2014 13:29 by author Kenny

ASP.NET Responsive Layout using Bootstrap

In this article we will explain about how to design responsive layout using bootstrap in your ASP.NET site. ASP.NET is an open source server-side Web application framework designed for Web development to produce dynamic Web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services.

ASP.NET Responsive Layout:

Responsive Web design is the approach that suggests that design and development should respond to the user's behavior and environment based on screen size, platform and orientation. The practice consists of a mix of flexible grids and layouts, images and an intelligent use of CSS media queries.

Why You Need Responsive Web Design?

Every people open website on mobile device, tablet device and desktop on different-different size that time our website layout is not good looking so web designer design the different-different website for different-different devices for good look and feel website so that process is very time taken. So reduce that process invent to “Responsive Layout” word.

Pillar of Responsive Layout:

1. Fluid Grids:

The general practice in web design is to employ fixed width layouts. It means that the page and its constituent elements have a fixed size and width and positioned around the center. Liquid layouts offer us a greater advantage with the increasing number of devices with web access. A liquid layout expands with the page.

2. Flexible Images:

Web page text is fluid by default: as the browser window narrows, text reflows to occupy the remaining space. Images are not naturally fluid: they remain the same size and orientation at all configurations of the viewport, and will be cropped if they become too large for their container. This creates a problem when displaying images in a mobile browser: because they remain at their native size, images may be cut off or displayed out-of-scale compared to the surrounding text content as the browser narrows.

3. Media Queries:

Fluid grid layouts are very important for responsive web development, but there are other issues to consider. If the width of the device becomes too narrow, like in a small mobile phone, the website design can fall apart. This is where media queries come in. These media queries are based in CSS3 and allow us to not only target the particular device classes but physical characteristics of the device which is rendering the web site.

Add these four files:

<link href="~/Content/bootstrap-3.1.1-dist/css/bootstrap.min.css" rel="stylesheet" />
<link href="~/Content/blog.css" rel="stylesheet" />
<script src="~/scripts/jquery-2.1.0.min.js"></script>
<script src="~/scripts/bootstrap-3.1.1-dist/js/bootstrap.min.js"></script>

Example:

Html Code

<header class="navbar navbar-inverse navbar-fixed-top bs-docs-nav" role="banner">
    <div class="container">
        <div class="navbar-header">
            <button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".bs-navbar-collapse">
                <span class="sr-only">Toggle Navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            @Html.ActionLink("Brand", "Index", "Home", null, new { @class = "navbar-brand" })
        </div>
        <nav class="collapse navbar-collapse bs-navbar-collapse" role="navigation">
            <ul class="nav navbar-nav">
                <li class="active">@Html.ActionLink("Home", "", "")</li>
                <li>@Html.ActionLink("Article", "", "")</li>
                <li>@Html.ActionLink("Blog", "", "")</li>
                <li>@Html.ActionLink("Forum", "", "")</li>
                <li>@Html.ActionLink("Interview", "", "")</li>
                <li class="dropdown">
                    <a class="dropdown-toggle" data-toggle="dropdown" href="#" id="themes">Themes <span class="caret"></span></a>
                    <ul class="dropdown-menu" aria-labelledby="themes">
                        <li><a href="../default/">Default</a></li>
                        <li class="divider"></li>
                        <li><a href="../david/">David</a></li>
                        <li><a href="../lily/">Lily</a></li>
                        <li><a href="../jasmine/">Jasmine</a></li>
                    </ul>
                </li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li>@Html.ActionLink("Sign Up", "", "")</li>
                <li>@Html.ActionLink("Login", "", "")</li>
                <li>
                    <form class="navbar-form navbar-left" role="search">
                        <div class="form-group">
                            <input type="text" class="form-control" placeholder="Search">
                        </div>
                    </form>
                </li>
            </ul>
        </nav>
    </div>
</header>
<div class="container">
    <br />
    <br />
    <div class="row">
        <img src="~/Content/Images/Sample1.png" class="banner" />
    </div>
    <br />   
    <div class="row">
        <div class="col-md-4">
            <img src="~/Content/Images/mobile-devlopment.png" />
        </div>
        <div class="col-md-8">
            <p>

Web page text is fluid by default: as the browser window narrows, text reflows to occupy the remaining space. Images are not naturally fluid: they remain the same size and orientation at all configurations of the viewport, and will be cropped if they become too large for their container. This creates a problem when displaying images in a mobile browser: because they remain at their native size, images may be cut off or displayed out-of-scale compared to the surrounding text content as the browser narrows.

 </p>
        </div>
    </div>
    <br />
    <br />
    <div class="well">
        <div class="row">
            <div class="col-md-6">
                <label>First Name</label>
                <input type="text" />
            </div>
            <div class="col-md-6">
                <label>Last Name</label>
                <input type="text" />
            </div>
        </div>
        <br />
        <div class="row">
            <div class="col-md-6">
                <label>Email ID</label>
                <input type="text" />
            </div>
            <div class="col-md-6">
                <label>Country</label>
                <select>
                    <option>---Select---</option>
                    <option>USA</option>
                    <option>UK</option>
                    <option>Netherland</option>
                    <option>Hongkong</option>
                </select>
            </div>
        </div>
        <br />
        <div class="row">
            <div class="col-md-6">
                <label>State</label>

                <select>
                </select>
            </div>
            <div class="col-md-6">
                <label>City</label>
                <select>
               </select>
            </div>
        </div>
        <br />
        <div class="row">
            <div class="col-md-6">
                <label>Zip Code</label>
                <input type="text" />
            </div>
            <div class="col-md-6">
                <label>Contact No</label>
                <input type="text" />
            </div>
        </div>
        <br />
        <div class="row">
            <div class="col-md-12 text-right">
                <input type="button" value="Submit" class="btn btn-info" />
                <input type="button" value="Clear" class="btn btn-info" />
            </div>
        </div>
    </div>
    <br />
    <br />
</div>

Blog.css

Img
{
    width: auto;
    max-width: 100%;
}
.banner {
    width:100%;
    height:250px;

}
input[type='text'],select {
    width:100%;
    height:30px;
}
@media screen and (min-width: 100px) and (max-width:750px) {
    .banner {
        display:none;
    }
}



ASP.NET 4.5.2 Hosting with ASPHostPortal :: How to Publish and Deploy an ASP.NET Application in IIS

clock September 16, 2014 12:08 by author Kenny

Simple Way to Publish and Deploy an ASP.NET Application in IIS

ASP.NET is an open source server-side Web application framework designed for Web development to produce dynamic Web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services. While Internet Information Services (IIS, formerly Internet Information Server) is an extensible web server created by Microsoft for use with Windows NT family. IIS supports HTTP, HTTPS, FTP, FTPS, SMTP and NNTP.

In this post, we will describe you how to publish and deploy your ASP.NET application in IIS. Actually it is so simple thing, you can publish your web application to the File System and copy paste all the files to your server. After that, you can add a new website from IIS. If you are not sure what files you should include, it's better to choose 'All files in the project' from the Package/Publish Web. Otherwise choose 'Only files needed to run this application'. You can set this by right clicking on the web application in the solution explorer and choosing 'Package/Publish Settings'.

Right click on your project in the solution explorer and choose 'Publish'. From the dialog box, as the publish method, choose 'File System'. And choose some directory as the Target Location.

You can add the website by right clicking on the 'Sites' in IIS.

Then give a name to your site and select the Physical path from where you copied the site folder

Best and Cheap ASP.NET Hosting

Are you looking for best and cheap ASP.NET Hosting? Look no further, ASPHostPortal.com is your ASP.NET hosting home! Start your ASP.NET hosting with only $1.00/month. All of our .NET hosting plan comes with 30 days money back guarantee, so you can try our service with no risk. Why wait longer?



ASP.NET 4.5.2 Hosting with ASPHostPortal.com :: SEO Tips for Your ASP.NET Site

clock August 23, 2014 09:42 by author Kenny

Here are 7 tips on SEO for your ASP.NET website:

A Microsoft server-side Web technology. ASP.NET takes an object-oriented programming approach to Web page execution. Every element in an ASP.NET page is treated as an object and run on the server. An ASP.NET page gets compiled into an intermediate language by a .NET Common Language Runtime-compliant compiler.

Page Titles

Page titles between tags is one important thing that many fail to practice in SEO. When a search is made in Google, these titles show up as links in the result. So that explains its importance. The common mistake among website owners is giving the same title for all pages. Page titles drive traffic to your site, hence it is important to have a proper title to attract visitors. Adding titles is not as hard as you imagine. If you have a product catalog use your product name as title. You can also choose to give a different title that is related to your product.

Meaningful URL

URLs that are long with query parameters do not look neat and it is difficult for the visitor to remember. Instead use formatted URLs for your static pages. URL which has a meaning explains the content in your website. Although experts agree with using an URL that has query parameters, it is better to have a meaningful URL. Components like UrlRewritingNet can be used for this purpose. Mapping support in URL is offered by IIS7 which has plenty of features.

Structure of the Content

Content without a structure is not possible.  You will have titles, headings, sub headings, paragraphs and others. How would you emphasize some quotes or important points in your content? If you follow the below mentioned steps, the structure of your content will be semantically correct.

  • Divide long stories or parts using headings. Short paragraphs make more sense to the readers. Use tags to bring beauty to your content.
  • If you want to emphasize an important point or quote, place them between tags.

Visitors can create structured content if you use FCKEditor and the like. Integrating these to your website is not complex.

Clean the Source Code

Don’t panic, it is advisable to clean up the source code and minimize the number of codes. The following simple steps will assist you in cleaning the source code: You can use

  • External stylesheets and not inline CSS
    • js files instead of inline JavaScript
  • HTML comments is not encouraged
  • Avoid massive line breaking
  • Avoid using viewstate when not required

The relation between the content and the code (JavaScript, HTML, CSS) determines the ranking of your website. Smaller source codes help build a strong relation.

Crawlable Site

Do not use

  • Silver or flash light for menus or to highlight information
  • Menus based on JavaScript
  • Menus based on buttons
  • Intro-pages

Do use

  • Simple tags wherever possible
  • Sitemap
  • “Alt” for images
  • RSS

Test the Site

What happens to the requests that are sent when the site is slow? Sometimes requests are sent by robots and if they are unable to connect to your site continuously, they drop the site from their index. Enable your site to respond fast to requests even during peak hours. Moreover, visitors don’t like to visit slow sites. Use the various tools available and conduct the stress test for your site. Perform this and locate all the weak parts of the site. Fix them so that your site gets indexed. 

Test the AJAX site

Spiders can only run a few parts of your AJAX website because they don’t run JavaScripts. Spiders can only analyze the data and hence they remain invisible to robots. The AJAX sites do not get indexed which does not help in search engine optimization. To make the site spider friendly, try and keep away from initial content loading into the JavaScript. You can also follow this only for pages that you like to index.  Make it easy for robots so that they can navigate. Try this simple trick to see how your AJAX site will appear to the robots. Disable JavaScript from the browser and visit your AJAX site. You can view the pages which robots will index.



Cheap ASP.NET 4.5 Hosting

We’re a company that works differently to most. Value is what we output and help our customers achieve, not how much money we put in the bank. It’s not because we are altruistic. It’s based on an even simpler principle. "Do good things, and good things will come to you".

Success for us is something that is continually experienced, not something that is reached. For us it is all about the experience – more than the journey. Life is a continual experience. We see the Internet as being an incredible amplifier to the experience of life for all of us. It can help humanity come together to explode in knowledge exploration and discussion. It is continual enlightenment of new ideas, experiences, and passions


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