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ASP.NET Hosting - ASPHostPortal.com :: 9 Mistakes to be Avoided by .NET Developer

clock June 6, 2016 23:50 by author Dan

Admit it! We all make mistakes. None of our codes starts working at strike one. We make typos, forget signing off or, as it happens with most of us, overlook the testing phase, especially when it comes to ASP.net development. To err is human. So, making mistakes is just another human phenomenon. What counts is how you tackle your errors and how you devise ways to avoid them in the ventures to come. Here's a compilation of some of the most common testing mistakes that developers often commit while catering to outsource .Net development needs. Let's take a look.

XSS Security Issues: The look and feel of your UI and of course, its maintenance lies in your hands. Ensure that all user-input fields are well-customized so that no JavaScript or HTML that a user enters can rummage your web page.

Universal Localization: As a usual norm, as you begin developing a new feature, you keep all the text in hard code as there are probabilities of certain changes during the course of development. As soon as the project team approves the feature, you localize the text. However, at times you tend to forget localizations of the entire text. You remember to hard code, but when it comes to localization you tend to sign off without doing the same. Probably this checklist reminds us to localize before we sign off the next time.

.Net Behaves Well with IE 6 and 7 and Firefox: Test leads often report of cross-browser compatibility issues that crop up from time to time. Most of these issues usually encompass small twigs like usual IE 6 issues or minor problems relating to positioning of elements. We are dedicatedly focusing on IE version 6 and 7 and Mozilla Firefox for two reasons. Firstly, if your web page works well in these three browsers, it will function well on Opera and Safari as well. Secondly, over 98% of the visitors access your site through these browsers.

Reuse Code as and when required: This law is applicable across all programming platforms and ASP.Net is no exception. Separate server and user-control elements enable specialization of code so that it can be used at other places as well.

Commenting on the Code: There are no two-ways to this. Always document your code well and comment upon the right places, so that it is easier for other developers to pick up from where you left.

Extended Text doesn't Mean Broken Design: As a matter of fact, names usually don't extend beyond 50 characters, but what if some user inputs a name containing 300 or even more characters. Obviously, in that case the UI will be disrupted. In this case you have two options- either codes your interface to accept long text inputs or put a limit on the length of text users can input.

Write Units When Possible: Unit testing for your website can be a tedious job especially if you are not using ASP.Net MVC framework for the same. However, pulling the code-behind logic into different components that can be placed in the library can enable you to test the units. Instead of dealing with HttpHandlers using .ashx files, placing them in separate libraries is a good option.

Peer Verification before Testing: Before signing off any newly added feature and sending it across to the test team, you usually pass it through peer verification. As the name suggests, in peer verification, one of your colleagues tests the application feature you have just developed and tries to find flaws in it. This allows you to identify errors easily and also simplifies the process for the testing team. When schedules are really tight, we often forget to ask for peer verification and it definitely shows at the end.

Expected functioning of Enter-key: When you are using webforms in ASP.Net, the enter-key often starts functioning weirdly. In this case, you can either set default buttons on the Panel webcontrol or from code-behind.

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ASP.NET hosting -ASPHostPortal.com :: Top 10 Tips You Shall Know on Choosing ASP.NET Hosting

clock April 22, 2016 20:34 by author Armend

Top 10 Tips You Shall Know on Choosing ASP.NET Hosting

Being devoted into ASP.NET development and ASP.NET website hosting for a couple of years, we know the secrets hidden in the ASP.NET hosting advertisement and how difficult to find a trusted and cost effective ASP.NET hosting provider. Thus, we would like to show you the top 10 tips on choosing ASP.NET hosting providers before starting with our topic.

  1. MS SQL Server database edition and limitation. The latest version of MSSQL 2012 are preferred.
  2. .NET Framework versions. Does it support the version used for your website?
  3. ASP.NET MVC versions. Does it support the version used for your website if you’re using ASP.NET MVC technology?
  4. Does it provide the dedicated application pool so that you won’t be affected by your neighbors?
  5. How long the IIS is set to recycle your website – usually 30 minutes at least is required.
  6. What’s the maximum dedicated memory allowed for the ASP.NET websites?
  7. The hosting provider needs to have the rich experiences and knowledge of how to ensure the high-quality ASP.NET hosting. Besides, it is great that they have got plenty of positive feedbacks from real customers and have been trusted and recommended by a lot of authorities, communities and hosting review sites.
  8. The ASP.NET hosting needs to ensure a high level of hosting reliability with at least 99.9% uptime. Note that this can be achieved with the utilization of cutting-edge data centers, solid server machines and no overselling practice. In addition, some confident web hosts even claim to give you some compensations if they fail to meet their promised uptime track record.
  9. The hosting speed is also pretty essential. After all, your readers can be frustrating if they find it takes a long time for accessing your website. In this case, you need to figure out that whether your web host can ensure the peak performance with no more than 3 seconds for page loading and 400 ms for the server response.
  10. The web host needs to ensure the all-time-rounded technical support to assist you 24 hours a day and 7 days a week. Also, their support staffs need to have the rich knowledge about ASP.NET hosting and related applications.

General Knowledge about ASP.NET

ASP.NET is the server-side online application framework coming with the open source nature. It is designed with the purpose of web development and dynamic webpages production mainly. In addition, developed by Microsoft, ASP.NET has been used by a lot of programmers for the creation of complicated websites, online applications and add-on services.
In fact, ASP.NET has been released since January 2002, which is the successor to the Active Server Pages technology of Microsoft. As it is built based on the Common Language Runtime, developers and programmers can write the ASP.NET code with the help of .NET language.

 



ASP.NET Hosting - ASPHostPortal.com :: How to Check Duplicate User Names In ASP.NET Web Pages Sites

clock October 5, 2015 11:39 by author Kenny

How to Check Duplicate User Names In ASP.NET Web Pages Sites

The Web Pages Starter Site template provides a useful starting point for developing a Razor Web Pages site that includes membership. But it doesn't include any mechanism for preventing duplicate user names. This article offers one solution to the problem that uses jQuery.

If you ask how to prevent duplicate user names in forums, one of the suggestions that is often put forward is to apply a unique constraint in the database column that holds the user name. Any attempt to submit a duplicate value will result in an exception being raised in the relevant database provider. You can catch this exception and show the user an appropriate message. This works but it's a fairly clunky solution. And many people feel that you should not use exceptions as a means to manage your business rules.

The solution featured in this article uses AJAX to query the database and to give the user immediate feedback when they enter their chosen user name. The AJAX call requests a page that exists purely to query the database to see if the selected user name is already in use. The solution also includes a server side chekc to ensure that users who have disabled JavaScript so not slip through the net. The solution requires a couple of amendments to the Register.cshtml file in the Starter Site, and the addition of 3 files. But first, the changes to the Register.cshtml page. The first change is in the inclusion of a JavaScript file called dupecheck.js.

@* Remove this section if you are using bundling *@
@section Scripts {
    <script src="~/Scripts/jquery.validate.min.js"></script>
    <script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
    <script src="~/Scripts/dupecheck.js"></script>
}

And the second is the server side check to see if the username is in use:

if(Functions.IsDuplicate(email)){
    ModelState.AddError("email", "User name is already taken");
}

I placed this in the if(IsPost) section just after the initial variables that represent the submitted values (email, password and confirmPassword) are declared. The code calls a function named IsDuplicate. The function is declared in a file called Functions.cshtml which is placed in a folder called App_Code:

@functions {
    public static bool IsDuplicate(string username){
        var db = Database.Open("StarterSite");
        var commandText = @"SELECT COUNT(Email) FROM UserProfile WHERE Email = @0";
        return (int)db.QueryValue(commandText, username) > 0;
    }
}

Note that the name of the folder is important. The function returns a bool. The value of the bool is determined as a result if the SQL query which gets a count of the rows containing the provided user name. By default, the Starter Site uses a column called Email in the UserProfile table for the storage of user names. This function is also called in a separate file named DupeCheck.cshtml. This file is placed in the root of the site:

@{
    Layout = null;
    if(IsAjax){
        var username = Request["username"];
        var result = Functions.IsDuplicate(username);
        Json.Write(new { isDupe = result }, Response.Output);
    }
}

DupeCheck.cshtml is designed to work exclusively with AJAX. The code includes an instruction to nullify any layout pages that might have been set in a _PageStart file, and then it uses the IsAjax property to determine if the page has been requested via an AJAX call. If it has, it uses the IsDuplicate method to check the availability of the posted username and returns the result to the calling code. The result is an anonymous type that has one propery: isDupe, which is a boolean. The anonymous type is serialised to JSON by the Json helper.

The final part of the solution is the dupecheck.js file. This uses jQuery:

$(function () {
    $('#email').change(function () {
        $.post(
            '/DupeCheck',
            { username: $(this).val() },
            function (data) {
                var emailValidation = $('span[data-valmsg-for="email"]');
                if (data.isDupe) {
                    if (emailValidation.hasClass('field-validation-valid')) {
                        emailValidation.removeClass('field-validation-valid');
                        emailValidation.addClass('field-validation-error');
                        emailValidation.text('That name is already taken!');
                    }
                } else {
                    if (emailValidation.hasClass('field-validation-error')) {
                        emailValidation.removeClass('field-validation-error');
                        emailValidation.addClass('field-validation-valid');
                        emailValidation.text('');
                    }
                }
            },'json'
        );
    });
});

An event handler is attached to the change event of the user name input (which has an id if email in the Starter Site). The current value is posted to the DupeCheck.cshtml page via AJAX. The code above checks the response from the server to see if the value is a duplicate, and if it is, an appropriate error message is displayed to the user.

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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);

Best ASP.NET 4.6 Hosting Recommendation

ASPHostPortal.com provides its customers with Plesk Panel, one of the most popular and stable control panels for Windows hosting, as free. You could also see the latest .NET framework, a crazy amount of functionality as well as Large disk space, bandwidth, MSSQL databases and more. All those give people the convenience to build up a powerful site in Windows server. ASPHostPortal.com offers ASP.NET hosting starts from $1/month only. They also guarantees 30 days money back and guarantee 99.9% uptime. If you need a reliable affordable ASP.NET Hosting, ASPHostPortal.com should be your best choice.



ASP.NET Hosting - ASPHostPortal.com :: Easy Steps to Make 2 DateTime objects difference in milliseconds

clock September 11, 2015 06:43 by author Dan

DateTime difference in Milliseconds

The following asp.net c# example source code demonstrate us how can we get difference in milliseconds between two datetime objects. in this source code, we created a datetime type variable by DateTime.Now property that holds a value that represent the current system date and time. now we initialize a new datatime variable with a value that is two minutes greater than previous datetime variable.

after initializing two datetime variables, we create a timespan object by subtract two datetime object. at last we convert the timespan object into milliseconds. the converted milliseconds is the difference between two datetime objects.

DateTime.Now property gets a datetime object that represent current date and time on web server. DateTime.Subtract() method subtract two datetime objects and return a timespan object. TimeSpan represents a time interval.

datetime-difference-in-milliseconds.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>
   
<!DOCTYPE html>     
<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e)
    {
        //initialize a datetime variable with current datetime
        DateTime now = DateTime.Now;

        Label1.Text = "now : " + now.ToString();

        //add 2 minutes to current time
        DateTime dateAfter2Minutes = now.AddMinutes(2);

        TimeSpan ts = dateAfter2Minutes - now;
        //total milliseconds difference between two datetime object
        int milliseconds = (int)ts.TotalMilliseconds;
      
        Label1.Text += "<br ><br />after two minutes: ";
        Label1.Text += dateAfter2Minutes.ToString();

        Label1.Text += "<br ><br />smillieconds difference between to datetime object : ";
        Label1.Text += milliseconds;
    }
</script>     
     
<html xmlns="http://www.w3.org/1999/xhtml">     
<head id="Head1" runat="server">     
    <title>c# example - datetime difference in milliseconds</title>     
</head>     
<body>     
    <form id="form1" runat="server">     
    <div>     
        <h2 style="color:MidnightBlue; font-style:italic;">     
            c# example - datetime difference in milliseconds
        </h2>     
        <hr width="550" align="left" color="Gainsboro" />     
        <asp:Label      
            ID="Label1"      
            runat="server"     
            Font-Size="Large"   
            Font-Names="Comic Sans MS"
            >     
        </asp:Label>     
        <br /><br />   
        <asp:Button      
            ID="Button1"      
            runat="server"      
            Text="get milliseconds difference between two datetime"     
            OnClick="Button1_Click"   
            Height="40"     
            Font-Bold="true"     
            />     
    </div>     
    </form>     
</body>     
</html>

the above image describe this example code better. this output screenshot display that at first line we created a DateTime variable. second line we created another datetime object by adding two minutes with first datetime object. final line shows the difference of two datetime objects in milliseconds. one second equal to one thousand milliseconds.

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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 error while posting data from ASP.Net 4.5 to ASP.Net 2.0

clock June 26, 2015 12:48 by author Dan

We caught up in the following scenario:

    We have a web application which runs on .Net 2.0 framework.
    Customer has a web application which runs on .Net 4.5 framework.

When they are posting data from one of their page to our pages, we are getting system errors. To validate the issue I have deployed two web applications on same server and tried to post a form from webapp 1 (on 4.5) to webapp 2 (on 2.0). I am getting below error.

[ViewStateException: Invalid viewstate.
Client IP: 127.0.0.1
Port: 63153
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)
ViewState: /wEPDwUKLTM1MTA1NjA1MmRk6CPd6yG4r8HEbqBZi3i4jiLLnZotIlX7+6zAZaceaGY=
Referer: http://localhost/test4/default.aspx
Path: /test2/default.aspx]

[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +148
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +11065601
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +59
System.Web.UI.HiddenFieldPageStatePersister.Load() +11065704
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +11150648
System.Web.UI.Page.LoadAllState() +46
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11146167
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11145706
System.Web.UI.Page.ProcessRequest() +91
System.Web.UI.Page.ProcessRequest(HttpContext context) +240
ASP.default_aspx.ProcessRequest(HttpContext context) in     c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET     Files\test2\b4717a74\d7ba8639\App_Web_ha1suqrp.0.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +599
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171


I tried the following:

    EnableViewState = false in Page tag. But still .Net is adding a _VIEWSTATE hidden variable.

   Added a Javascript function to set _VIEWSTATE hidden variable to empty. This resolved the issue.

Though second work solutions resolved the problem, I am looking for better ways to solve this kind of issue.
Best Answer

EnableViewState = false only turns off the ViewState, but not the control state of the ASP.NET server controls, that's why you still have the hidden VIEWSTATE control.

The ViewState is hash coded on the server, therefore you should use the same key's to generate the hash. You set the <machinekey> in your machine.config file to the same value on both applications/servers. The default value is AutoGenerate, which means that every server has it's own machinekey. You find more information here

As an alternative you turn the hashing off by setting EnableViewstateMac to false (basically what your error message says). By doing this users could manipulate your ViewState.

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ASP.NET 4.5.2 Hosting with ASPHostPortal.com :: How to Bind Pages in ASP.NET

clock September 29, 2014 12:31 by author Kenny

How to Bind Pages in ASP.NET

ASP.NET is a unified Web development model that includes the services necessary for you to build enterprise-class Web applications with a minimum of coding. ASP.NET is part of the .NET Framework, and when coding ASP.NET applications you have access to classes in the .NET Framework. You can code your applications in any language compatible with the common language runtime (CLR), including Microsoft Visual Basic and C#. These languages enable you to develop ASP.NET applications that benefit from the common language runtime, type safety, inheritance, and so on.

If you are familiar with classic ASP, the declarative data binding syntax introduced in ASP.NET will be familiar to you even though the functionality is vastly different. Data binding expressions are the code you see between <%# and %> characters in an ASPX file. The expressions allow you to easily bind controls to data sources, as well as properties, expressions, and results from method calls exposed by the page. While this feature is easy to use, it often causes some confusion about what is allowed and whether it should be employed.

Data binding basics

Data binding expressions link ASP.NET page properties, server control properties, and data sources when the page's DataBind method is called. You can place data binding expressions on the value side of an attribute/value pair in the opening tag of a server control or anywhere in the page. All data binding expressions, regardless of where you place them, must be contained between <%# and %> characters.

When used with data controls (like Repeater, DataGrid, and so forth), the expression parameter is usually a column name from the data source. However, as long as it returns a value, any valid expression may be used. Likewise, the same syntax may be used outside list controls. This includes displaying values on the page or populating control attributes.

Container.DataItem is a runtime alias for the DataItem bound to a specific item. It maps to an individual item from the data source—like one row from a database query or an individual element from an array. The actual data type for the DataItem is determined by the data source. So, if you're dealing with an array of integers, the DataItem will be an integer.

The following list provides a quick review of the VB.NET syntax for various scenarios:

<%# Container.DataItem %>--An array of string values is returned.
<%# Container.DataItem("expression") %>--The specific field from a DataView container is returned.

<%# Container.DataItem.PropertyName %>--The specific string property value of data source is returned.
<%# CStr(Container.DataItem.PropertyName) %>--Returns a property value converted to its string representation.

When you're using C#, the syntax is a bit different. The following list includes the corresponding C# code for each line in the previous list. Notice the basic syntax is the same, but it changes when property values are returned and converted to the appropriate data type.

<%# Container.DataItem %>
<%# ((DataRowView)Container.DataItem)["PropertyName"] %>
<%# ((ObjectType)Container.DataItem).PropertyName %>
<%# ((ObjectType)Container.DataItem).PropertyName.ToString() %>

Syntax is consistent when working with page level properties and methods. The syntax remains the same as long as string values are returned. The following list provides some examples:

<%# propertyName %>--The value for a page level property is returned.
<asp:ListBox id="lstValues" datasource='<%# propertyName %>' runat="server">--The value retrieved from the page level property (array, collection of objects, etc.) is bound to the data control.

<%# (objectName.PropertyName) %>--The value of the page level object property is displayed.
<%# MethodName() %>--The value returned from the page method is displayed.

You may use individual values (albeit properties, method return values, and so forth) on a page using the following syntax:
<%= Value %>

Using the Contain.DataItem object can be tedious, since you must be aware of the data type and convert it accordingly for use. Microsoft does provide the DataBinder class to further simplify development.

Working with DataBinder

Microsoft documentation (on MSDN) states the DataBinder class uses reflection to parse and evaluate a data binding expression against an object at runtime. This method allows RAD designers, such as Visual Studio .NET, to easily generate and parse data binding syntax. This method can also be used declaratively on a Web form's page to simplify casting from one type to another.

You can use the Eval method of the DataBinder class to make .NET do the heavy lifting when using data values in an ASP.NET page. The Eval method accepts the previously covered Container.DataItem object; it works hard to figure out the details of the field identified in the expression and displays it accordingly. It has the following syntax:

DataBinder.Eval(Container.DataItem, "field name", "optional formatting")

The DataBinder.Eval approach is great as it pushes work to the system. On the other hand, you should use it with caution, since time and resources are consumed as the system locates the element and determines its object/data type.

Plenty of options

Data binding makes it relatively simple to include data in ASP.NET pages. There are various data binding options available, which include: binding the data to a control and allowing it to decide how it is presented, or choosing declarative data binding to control presentation within the ASP.NET page. In the end, it comes down to your preference, but it is great to have options.

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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

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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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