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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I was attempting to set up a new ASP.NET 4.0 web on my dev machine, running Windows 7 and IIS 7. I ran into several errors, that I suspect others may encounter, and I had to search all over the web to find all the answers. So I’ve written this post in the hopes it saves some other dev the same headache I had!

So, first I created the new website and app pool identity, but when I hit the site for the first time, I got the following error:

HTTP Error 500.19 – Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.
After searching for solutions, I found most had to do with permissions to the web.config file or actual locking of sections of the web.config file. I confirmed that the app pool identity had permissions to the file, and there were no locking attributes in the file. So something else had to be the issue. Then I found some post on asp.net forum.
It turns out that ASP.NET had not been configured fully on my machine. So, according to one of the answers on the post, the solution is to do the following steps:
1. Open control panel
2. Click on “Programs and Features”
3. Click on ”Turn windows features on/off”
4. Locate ”Internet Information services IIS” in the pop up window and expand its node
5. Expand the ”World Wide Web Service” node
6. Expand “Application Development Features” node
7. Check the check box of”ASP.NET”
8. Then click ok button
9. You will need to restart your computer (go get a cup of coffee…)

After restarting, and hitting the site again, I got this new error:

HTTP Error 500.21 – Internal Server Error

Handler “PageHandlerFactory-Integrated” has a bad module “ManagedPipelineHandler” in its module list
Another web search revealed that even though the step above enabled ASP.NET, it was not fully installed. To fix this problem basically, just open a command window and enter the command shown below (command is slightly different for 32-bit vs. 64-bit).
64-bit:
%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i

32 bit:
%windir%\Microsoft.NET\Framework\v4.0.21006\aspnet_regiis.exe -i

If you get a permissions error, you need to run the window as an administrator. To do this, go to start |run, and type ‘cmd’, but hit Ctrl-Shift-Enter, instead of just Enter.
After doing that, I hit the site again, and it worked! Hope this has helped!

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Data Annotations Validation in ASP.NET

This article explains how to use data annotations for validation in ASP.Net 4.5. So, let's proceed with the following
The effect of a custom validation message: Required, String Length, Data Type, Range, Compare and Regular Expression.

Creating a Registration Page

Create a new project using "File" -> "New" -> "Project..." then select web "ASP.NET Web Forms Application". Name it "DataAnnotationsValidation".
seelct New ASP.NET Project then select the template Empty and select Web Forms then click OK.
Next, create the code-behind as follows, displaying the validation errors to the users in the Registration.aspx.

Registration.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Registration.aspx.cs" Inherits="DataAnnotationsValidation.Registration" %> 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
    <title>Employees Registration</title> 
    <link href="Content/bootstrap.min.css" rel="stylesheet" /> 
</head> 
<body> 
    <form id="form1" runat="server"> 
        <div class="container"> 
            <div class="well"> 
                <h1>Data Annotations  Validation in ASP .NET 4.5 </h1> 
            </div> 
            <div class=" panel panel-default"> 
                <div class="panel-heading"> 
                    <h3 class="panel-title">Employees Registration</h3> 
                </div> 
                <div class="panel-body"> 
                    <div class="text-center"> 
                    <asp:ValidationSummary ID="validationSummary" runat="server" ShowModelStateErrors="true" DisplayMode="List" ForeColor="Red"  /> 
                    </div> 
                        <div class="col-md-8"> 
                            <div class="form-group col-lg-12"> 
                                <label>First Name</label> 
                                <asp:TextBox ID="FirstName" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-12"> 
                                <label>Last Name</label> 
                                <asp:TextBox ID="LastName" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-12"> 
                                <label>User ID</label> 
                                <asp:TextBox ID="UserID" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Password </label> 
                                <asp:TextBox ID="Password" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Password Confirm </label> 
                                <asp:TextBox ID="PasswordConfirm" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Mobile </label> 
                                <asp:TextBox ID="Mobile" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Age </label> 
                                <asp:TextBox ID="Age" runat="server" class="form-control"></asp:TextBox> 
                            </div>                             
                            <div class="form-group col-lg-6"> 
                                <label>Email </label> 
                                <asp:TextBox ID="Email" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Email Confirm </label> 
                                <asp:TextBox ID="EmailConfirm" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>DOB </label> 
                                <asp:TextBox ID="Date" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Salary </label> 
                                <asp:TextBox ID="Total" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>City </label> 
                                <asp:TextBox ID="HomeCity" runat="server" class="form-control"></asp:TextBox> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <label>Department </label> 
                                 
                                <asp:DropDownList ID="Department" runat="server" class="form-control"> 
                        <asp:ListItem Value="">Choose an Option</asp:ListItem>
                        <asp:ListItem Value="HR">HR</asp:ListItem> 
                        <asp:ListItem Value="Account">Account</asp:ListItem> 
                                    </asp:DropDownList> 
                            </div> 
                            <div class="form-group col-lg-6"> 
                                <asp:Button ID="btnsubmit" runat="server" Text="submit" /> 
                            </div> 
                        </div>                     
                </div> 
                </div> 
            </div> 
    </form> 
</body> 
</html>

Create DataAnnotationsValidation.Models for Validation
Now, do something with Models then click Add -> Class.
Applying validation attributes to the Validation class

Validation.cs

    using System; 
    using System.Collections.Generic; 
    using System.Linq; 
    using System.Web;   
    //using Namespace 
    using System.ComponentModel.DataAnnotations; 
    namespace DataAnnotationsValidation.Models 
    { 
        public class Validation 
        {         
            [Required] 
            [StringLength(120, MinimumLength = 3)] 
            public string FirstName { get; set; }  
            [Required] 
            [StringLength(120, MinimumLength = 3)] 
            public string LastName { get; set; } 
            [Required] 
            [StringLength(25, MinimumLength = 3)] 
            public string UserID { get; set; } 
            [Required] 
            [DataType(DataType.Password)] 
            public string Password { get; set; } 
            [Required] 
            [Compare("Password")] 
            public string PasswordConfirm { get; set; } 
            [Required] 
            [Range(18, 100, ErrorMessage = "Please enter an age between 18 and 50")] 
            public int Age { get; set; }   
            [Required]        
            [StringLength(10)] 
            public int Mobile { get; set; }           
            [RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}", ErrorMessage = "Email doesn't look like a valid email address.")] 
            public string Email { get; set; }     
            [Compare("Email")] 
            public string EmailConfirm { get; set; }    
            [Range(typeof(decimal), "0.00", "15000.00")] 
            public decimal Total { get; set; }   
            [Required] 
            [DataType(DataType.Date)] 
            public DateTime Date { get; set; }       
            [Required] 
            public string HomeCity { get; set; }      
            [Required] 
            public string Department { get; set; }     
        } 
    } 

Next, create the code-behind as follows.

Registration.aspx.cs

    using System; 
    using System.Collections.Generic; 
    using System.Linq; 
    using System.Web; 
    using System.Web.UI; 
    using System.Web.UI.WebControls;     
    //using Namespace Models 
    using System.Web.ModelBinding; 
    using DataAnnotationsValidation.Models;    
    namespace DataAnnotationsValidation 
    { 
        public partial class Registration : System.Web.UI.Page 
        { 
            protected void Page_Load(object sender, EventArgs e) 
            { 
                if (IsPostBack) 
                { 
                    Validation v = new Validation(); 
                    if (TryUpdateModel(v, new FormValueProvider(ModelBindingExecutionContext))) 
                    { 
                        ShowMessage(v.ToString());                     
                    } 
                } 
            } 
            /// <summary> 
            /// This function is used for show message. 
            /// </summary> 
            /// <param name="msg"></param> 
            void ShowMessage(string msg) 
            { 
                ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('" + msg + "');</script>");
            }     
        } 
    }

Now run the page, it will look like the following to use validation to check the input.

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This article shows how to restrict the use of cut, copy and paste by the end user in the whole page.

In the real world, sometimes a developer needs to restrict a basic facility such as cut, copy and paste on an entire web page but not on a specific control. At that time you will need some easy way to stop these kinds of facilities on the page but not create code in every control to disable these facilities.
Suppose you have 20 "TextBox" controls in your page and you want to restrict the cut, copy and paste in all the textboxes, then you do not need to write the disable code in each TextBox. In this scenario, you need to just write the disable code only in the "body" tag.
To explain such implementation, I will use the following procedure.

Step 1

Create an ASP.Net Empty Website named "My Project".

Step 2

Add a new web form named "Default.aspx" into it.

Step 3

Add 2 "TextBox" controls to the page named "Default.aspx" .

Step 4

On Cut: By this, you can disable the "Cut " facility in both of the "TextBox" Controls.
Syntax: oncut= “return false”;

On Copy: By this, you can disable the "Copy " facility in both of the "TextBox" controls.
Syntax: oncopy= “return false”;

On Paste: By this, you can disable the "Cut" facility in both of the "TextBox" controls.
Syntax: onpaste= “return false”;

To disable the All (Cut, Copy and Paste) in the entire page:

Conclusion

In this article, I have described how to restrict the user to use the cut, copy and paste facilities in the entire page and I hope it will be beneficial for you.

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I used to be fiddling with ASP.NET 4.5 and Visual Studio 2012 particularly with all the new Validation attributes and i identified they function great, specially the new unobtrusive validation, then I attempted to permit this sort of validation over a new Vacant Net Software, and that i identified that this just isn't out-of-the-box, you'll need to create some configurations to your Net Application.

You'll find a few ways to allow the unobtrusive validation over a Internet Software:

Through the web.config file

<configuration> 
  <appsettings> 
   <add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForms"> 
  </add></appsettings> 
 </configuration> 

Via the Global.asax file

protected void Application_Start(object sender, EventArgs e)
{
   ValidationSettings.UnobtrusiveValidationMode = UnobtrusiveValidationMode.None;
}

On each page:

protected void Page_Load(object sender, EventArgs e)
{
   this.UnobtrusiveValidationMode = System.Web.UI.UnobtrusiveValidationMode.WebForms;
}

To disable the unobtrusive validation set the UnobtrusiveValidationMode property to None. Unobtrusive validation is actually enabled by default in ASP.Net 4.5.

We'll start with a simple example, create an Empty Web Application and add a MasterPage called Site.master and a content page for this master called Default.aspx.
Add the following code to the Default.aspx file:

<asp:TextBox runat="server" ID="txt" />
    <asp:RequiredFieldValidator ErrorMessage="txt is required" ControlToValidate="txt" runat="server" Text="*" Display="Dynamic" />
    <asp:Button Text="Send info" runat="server" />

If you try to run a simple ASPX page using a validator, the following exception will be thrown:

    "WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive)". Before fixing this, let's disable the unobtrusive validation to see the result.

On the page:

protected void Page_Load(object sender, EventArgs e)
{
   this.UnobtrusiveValidationMode = System.Web.UI.UnobtrusiveValidationMode.None;
}

Now run the page and the validation will work as it used to work in ASP.Net 4.0 If you examine the rendered HTML, you will see that the gross inline script is rendered:

<script type="text/javascript">
//<![CDATA[
var Page_Validators =  new Array(document.getElementById("ContentPlaceHolder1_ctl00"));
//]]>
</script>

<script type="text/javascript">
//<![CDATA[
var ContentPlaceHolder1_ctl00 = document.all ? document.all["ContentPlaceHolder1_ctl00"] : document.getElementById("ContentPlaceHolder1_ctl00");
ContentPlaceHolder1_ctl00.controltovalidate = "ContentPlaceHolder1_txt";
ContentPlaceHolder1_ctl00.errormessage = "txt is required";
ContentPlaceHolder1_ctl00.display = "Dynamic";
ContentPlaceHolder1_ctl00.evaluationfunction = "RequiredFieldValidatorEvaluateIsValid";
ContentPlaceHolder1_ctl00.initialvalue = "";
//]]>
</script>


<script type="text/javascript">
//<![CDATA[

var Page_ValidationActive = false;
if (typeof(ValidatorOnLoad) == "function") {
    ValidatorOnLoad();
}

function ValidatorOnSubmit() {
    if (Page_ValidationActive) {
        return ValidatorCommonOnSubmit();
    }
    else {
        return true;
    }
}
       
document.getElementById('ContentPlaceHolder1_ctl00').dispose = function() {
    Array.remove(Page_Validators, document.getElementById('ContentPlaceHolder1_ctl00'));
}
//]]>
</script>

Now let's re-enable the unobtrusive validation. In order to fix the previous exception, we need to install the following Nuget packages: (I like to install jQuery first to get the latest version, although this is not required.)

1. jQuery
2. ASPNET.ScriptManager.jQuery
3. Microsoft.AspNet.ScriptManager.MSAjax
4. Microsoft.AspNet.ScriptManager.WebForms

At this point, if you run the application again, the exception will be gone =) how cool eh?. This is because the following Nuget packages automatically register the scripts needed with the ScriptManager control.

Let's examine the code added by these Nuget packages using ILSpy:

AspNet.ScriptManager.jQuery

public static class PreApplicationStartCode
    {
        public static void Start()
        {
            string str = "1.8.1";
            ScriptManager.ScriptResourceMapping.AddDefinition("jquery", new ScriptResourceDefinition
            {
                Path = "~/Scripts/jquery-" + str + ".min.js",
                DebugPath = "~/Scripts/jquery-" + str + ".js",
                CdnPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-" + str + ".min.js",
                CdnDebugPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-" + str + ".js",
                CdnSupportsSecureConnection = true,
                LoadSuccessExpression = "window.jQuery"
            });
        }
    }

Microsoft.AspNet.ScriptManager.MSAjax

public static void Start()
{
    ScriptManager.ScriptResourceMapping.AddDefinition("MsAjaxBundle", new ScriptResourceDefinition
    {
        Path = "~/bundles/MsAjaxJs",
        CdnPath = "http://ajax.aspnetcdn.com/ajax/4.5/6/MsAjaxBundle.js",
        LoadSuccessExpression = "window.Sys",
        CdnSupportsSecureConnection = true
    });
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjax.js", "window.Sys && Sys._Application && Sys.Observer");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxCore.js", "window.Type && Sys.Observer");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxGlobalization.js", "window.Sys && Sys.CultureInfo");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxSerialization.js", "window.Sys && Sys.Serialization");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxComponentModel.js", "window.Sys && Sys.CommandEventArgs");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxNetwork.js", "window.Sys && Sys.Net && Sys.Net.WebRequestExecutor");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxHistory.js", "window.Sys && Sys.HistoryEventArgs");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxWebServices.js", "window.Sys && Sys.Net && Sys.Net.WebServiceProxy");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxTimer.js", "window.Sys && Sys.UI && Sys.UI._Timer");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxWebForms.js", "window.Sys && Sys.WebForms");
    PreApplicationStartCode.AddMsAjaxMapping("MicrosoftAjaxApplicationServices.js", "window.Sys && Sys.Services");
}
private static void AddMsAjaxMapping(string name, string loadSuccessExpression)
{
    ScriptManager.ScriptResourceMapping.AddDefinition(name, new ScriptResourceDefinition
    {
        Path = "~/Scripts/WebForms/MsAjax/" + name,
        CdnPath = "http://ajax.aspnetcdn.com/ajax/4.5/6/" + name,
        LoadSuccessExpression = loadSuccessExpression,
        CdnSupportsSecureConnection = true
    });
}

Microsoft.AspNet.ScriptManager.WebForms

public static void Start()
{
    ScriptManager.ScriptResourceMapping.AddDefinition("WebFormsBundle", new ScriptResourceDefinition
    {
        Path = "~/bundles/WebFormsJs",
        CdnPath = "http://ajax.aspnetcdn.com/ajax/4.5/6/WebFormsBundle.js",
        LoadSuccessExpression = "window.WebForm_PostBackOptions",
        CdnSupportsSecureConnection = true
    });
}

As you can see these Nuget packages automatically register the scripts using the ScriptManager object (besides installing the required JavaScript files)

Run the application and examine the rendered HTML. You will note that it's much cleaner now, in this case the inline script has been moved to an external file that can be rendered using bundles to increase performance. The rendered script looks like:

<script src="Scripts/WebForms/MsAjax/MicrosoftAjaxWebForms.js" type="text/javascript"></script>
<script src="Scripts/jquery-1.8.1.js" type="text/javascript"></script>

Much better right?. Notice how ASP.Net used HTML5 custom attributes:

<input name="ctl00$ContentPlaceHolder1$txt" type="text" id="ContentPlaceHolder1_txt" />
    <span data-val-controltovalidate="ContentPlaceHolder1_txt" data-val-errormessage="txt is required" data-val-display="Dynamic" id="ContentPlaceHolder1_ctl00" data-val="true" data-val-evaluationfunction="RequiredFieldValidatorEvaluateIsValid" data-val-initialvalue="" style="display:none;">*</span>
    <input type="submit" name="ctl00$ContentPlaceHolder1$ctl01" value="Send info" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$ContentPlaceHolder1$ctl01&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" />

The data-val-* are custom attributes used by the unobtrusive validation engine

If you click the button to trigger the validation you will be pleased to see that it works as expected...but we are not done yet =/

The settings we have applied won't work if you intend to use an UpdatePanel control (yeah the evil UpdatePanel again...). This is because this control requires a ScriptManager control on the page (or MasterPage) and we do not have any yet. So let's add a simple ScriptManager control to the master page and see what happens. Add the following code to the Site.master page right under the <form...

<asp:ScriptManager runat="server" ID="scriptManager">
        </asp:ScriptManager>

Run the page again and fire the validation... oops... the client validation has gone =( We only have server validation. I'm not sure why this happens but my best guess is that the just added ScriptManager control is overriding our code settings.

To fix it, change the declaration of the ScriptManager control on the Site.master page to:

<asp:ScriptManager runat="server" ID="scriptManager1">
        <Scripts>
            <asp:ScriptReference Name="MsAjaxBundle" />
            <asp:ScriptReference Name="jquery" />
            <asp:ScriptReference Name="WebForms.js" Assembly="System.Web" Path="~/Scripts/WebForms/WebForms.js" />
            <asp:ScriptReference Name="WebUIValidation.js" Assembly="System.Web" Path="~/Scripts/WebForms/WebUIValidation.js" />
            <asp:ScriptReference Name="MenuStandards.js" Assembly="System.Web" Path="~/Scripts/WebForms/MenuStandards.js" />
            <asp:ScriptReference Name="GridView.js" Assembly="System.Web" Path="~/Scripts/WebForms/GridView.js" />
            <asp:ScriptReference Name="DetailsView.js" Assembly="System.Web" Path="~/Scripts/WebForms/DetailsView.js" />
            <asp:ScriptReference Name="TreeView.js" Assembly="System.Web" Path="~/Scripts/WebForms/TreeView.js" />
            <asp:ScriptReference Name="WebParts.js" Assembly="System.Web" Path="~/Scripts/WebForms/WebParts.js" />
            <asp:ScriptReference Name="Focus.js" Assembly="System.Web" Path="~/Scripts/WebForms/Focus.js" />
            <asp:ScriptReference Name="WebFormsBundle" />
        </Scripts>
    </asp:ScriptManager>

Run the application and our little example will work again as expected

Sadly these new settings are the equivalent to the settings added by code and we need to add them to be able to use the traditional Microsoft AJAX controls.

There's one last thing we need to configure, this is because there's actually a bug with the ValidationSummary control.

To test it, update the Default.aspx page as follows:

<asp:ValidationSummary ID="ValidationSummary1" runat="server" />
    <br />
    <br />
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    <br />
    <br />
    <br />
    <br />
    <asp:TextBox runat="server" ID="txt" />
    <asp:RequiredFieldValidator ErrorMessage="txt is required" ControlToValidate="txt" runat="server" Text="*" Display="Dynamic" />
    <asp:Button Text="Send info" runat="server" />

Now run the page again, scroll down until you can see the button and click it... woot your page jumped to the top... the workaround to solve this little bug is to add the following code to the Site.master

<script>
            window.scrollTo = function () {

            };
        </script>

ASPHostPortal - In this article I would prefer to tell you just what the big difference in between these designs. Let’s commence with all the initial primary 1 - Model-View-Controller - it is a basic sample that applies in the several systems and every day tends to make simpler existence for programmers. If you ask computer software Architects about “How to apply this pattern”, I think you will get a pair of various answers and respectively a couple of answers. Basically, there is certainly 1 common point in these designs - is separation of User Interface (UI) from company logic, it allows do function for front-end developers not thinking about plan code. In the event you bear in mind college or university programming, it had been an enormous bunch of lines of code, composed in code behind (for instance) of .aspx documents, which is not a great practice.

MVC has a few key components: View (consumer interface), Product (company logic) and Controller (contains the logic that modifications the design because of to consumer steps, implements Use Situation). The fundamental idea of this pattern is that the controller and look at is determined by product, but the product will not depend on these two elements. It just permits you to definitely create and check a product without having realizing something concerning the sights and controllers. Preferably, the controller also will not must know about see (even though in follow this can be not often the situation) and, ideally, a single can switch controllers presentation, along with the exact same controller can be utilized for various sights (as an example, the controller might depends on person who is logged in). The consumer sees a check out, creates some motion, this motion redirects towards the controller and subscribes for adjustments from the product, controller makes particular operations with info design, and also the see will get the newest point out of the design and displays it for the consumer.

Implementation in ASP.NET looks like as follows (instance taken from MSDN [5]). Presentation - this can be a common aspx markup:

<html>
<body>
    <form id="start" method="post" runat="server">
        <asp:dropdownlist id="recordingSelect" runat="server" />
        <asp:button runat="server" text="Submit" onclick="SubmitBtn_Click" />
        <asp:datagrid id="MyDataGrid" runat="server" enableviewstate="false" />
    </form>
</body>
</html>

Model – a separate class, which has methods for obtaining data (model implementations often includes Data Access Level):

public class DatabaseGateway
{
   public static DataSet GetRecordings()
   {
     DataSet ds = ...
     return ds;
   }
 
   public static DataSet GetTracks(string recordingId)
   {
      DataSet ds = ...
      return ds;
   }
}

Example of a model is not the best in this case, but it’s still not always need to have a really describe the business model in the classes, sometimes it’s enough to work with DataSets. The most interesting thing is the implementation of the controller, in fact it’s code behind of aspx page

using System;
using System.Data;
using System.Collections;
using System.Web.UI.WebControls;
 
public class Solution : System.Web.UI.Page
{
    private void Page_Load(object sender, System.EventArgs e)
    {
        if (!IsPostBack)
        {
            DataSet ds = DatabaseGateway.GetRecordings();
            recordingSelect.DataSource = ds;
            recordingSelect.DataTextField = "title";
            recordingSelect.DataValueField = "id";
            recordingSelect.DataBind();
        }
    }
 
    void SubmitBtn_Click(Object sender, EventArgs e)
    {
        DataSet ds = DatabaseGateway.GetTracks((string)recordingSelect.SelectedItem.Value);
 
        MyDataGrid.DataSource = ds;
        MyDataGrid.DataBind();
    }
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
        //
        // CODEGEN: This call is required by the ASP.NET Web Form Designer.
        //
        InitializeComponent();
        base.OnInit(e);
    }
 
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.submit.Click += new System.EventHandler(this.SubmitBtn_Click);
        this.Load += new System.EventHandler(this.Page_Load);
 
    }
    #endregion
}

This approach will allow us to easily write tests for the model, but not for the controller (of course, all things are possible, but we need to try).

[TestFixture]
public class GatewayFixture
{
    [Test]
    public void Tracks1234Query()
    {
 
        DataSet ds = DatabaseGateway.GetTracks("1234");
        Assertion.AssertEquals(10, ds.Tables["Track"].Rows.Count);
    }
 
    [Test]
    public void Tracks2345Query()
    {
        DataSet ds = DatabaseGateway.GetTracks("2345");
        Assertion.AssertEquals(3, ds.Tables["Track"].Rows.Count);
    }
 
    [Test]
    public void Recordings()
    {
        DataSet ds = DatabaseGateway.GetRecordings();
        Assertion.AssertEquals(4, ds.Tables["Recording"].Rows.Count);
 
        DataTable recording = ds.Tables["Recording"];
        Assertion.AssertEquals(4, recording.Rows.Count);
 
        DataRow firstRow = recording.Rows[0];
        string title = (string)firstRow["title"];
        Assertion.AssertEquals("Up", title.Trim());
    }
}

This sample also is made up from the 3 parts. Looking at the diagram, it really is distinct that for representation is not essential to subscribe for adjustments inside the product, the controller is renamed as Presenter, lets illustration learn about modifications. Current strategy allows you to develop an abstraction of representation. To apply this pattern, you should create interfaces of illustration. Every illustration can have interfaces with a sets of strategies and qualities which can be required for presenter, presenter initializes with correct interface, subscribes for the events of illustration and offers data when it necessary. This approach permits you to develop programs utilizing the methodology of TDD (Test-driven development). This pattern can be utilized to ASP.NET, let us take a look at the prior instance. Depart representation and product from your earlier example, and code behind of the page we'll modify just a little bit.

//Abstract View
public interface ISolutionView
{
    string SelectedRecord { get; }
    DataSet Recordings { set; }
    DataSet Tracks { set; }
}
 
//Presenter
public class SolutionPresenter
{
    private ISolutionView _view;
    
    public SolutionPresenter(ISolutionView view)
    {
        _view = view;
    }
    
    public void ShowTracks()
    {
        DataSet ds = DatabaseGateway.GetTracks(_view.SelectedRecord);
        _view.Tracks = ds;
    }
    
    public void Initialize()
    {
        DataSet ds = DatabaseGateway.GetRecordings();
        _view.Recordings = ds;
    }
}
 
 
//View
public class Solution : System.Web.UI.Page, ISolutionView
{
    private SolutionPresenter _presenter;
    
    private void Page_Load(object sender, System.EventArgs e)
    {
        if(!IsPostBack)
        {
            _presenter.Initialize();
        }
    }
 
    override protected void OnInit(EventArgs e)
    {
        base.OnInit(e);
        _presenter = new SolutionPresenter(this);
        submit.Click += delegate { _presenter.ShowTracks(); };
    }
 
    public string SelectedRecord
    {
        get { return (string)recordingSelect.SelectedItem.Value; }
    }
    
    public DataSet Recordings
    {
        set
        {
            recordingSelect.DataSource = value;
            recordingSelect.DataTextField = "title";
            recordingSelect.DataValueField = "id";
            recordingSelect.DataBind();
        }
    }
    
    public DataSet Tracks
    {
        set
        {
            MyDataGrid.DataSource = value;
            MyDataGrid.DataBind();
        }
    }
}

Right now we have logic within the presenter, and we have been able to examination SolutionPresenter with I SolutionView individually by using Mocks.

Model-View-ViewModel

Right here once again, you will find 3 elements: model, see, as well as a 3rd part - an additional model referred to as ViewModel. This pattern is ideal for technologies, where there is a two-way Binding (synchronization) of elements to the product, as in WPF. Big difference between MVVM and MVP pattern is that for MVVM SelectedRecord property, from your previous illustration, needs to be positioned inside of the ViewModel, and it should be synchronized with the required field of see. So, this is the essential thought of ??WPF. ViewModel - it is type of tremendous converter that converts information of product to the representation, it describes the fundamental homes from the check out and the logic of conversation with the design.

While ASP.NET gives a great validator set of controls, now and then you have to "move your own" so to talk when making your controls. What's more, on the off chance that you have some AJAX preparing with your buttons in the background (for instance, sparing a record in a popup window) you run the danger of having "twofold spares" happening when the client clicks on the button and nothing happens instantly.

Having battled with this issue myself recently, it took somewhat more work than expected to get this to work legitimately. Here's the manner by which you get everything to play pleasantly together.

The first step is to wire up your code behind occasion that does your handling. In case you're doing this in C# you setup your Onclick occasion:

<asp:Button ID="btnSave" runat="server" Text="Save" OnClick="btnSave_Click" />

In case you're doing this in Vb.net, there's no compelling reason to utilize the Onclick value as a part of your button, you can go straight to the code behind, make your strategy name, and utilize the Handles pivotal word, pointing out your buttons click occasion:

Protected Void Sub btnSave_Click Handles btnSave.Click
' Code here
End Sub

The next step is to do our validation using Javascript (we’re using jQuery in here).

function validatePage()
{
    var check = true;

    // Check only simple textbox for now
    if ($("#txtImportant").val() == '') check = false;

    if (!check)
    {
       alert('Missing data. Please complete');
       return false;
    }
    else
    {
       $("#MainContent_btnSave").val('Processing...');
       $("#MainContent_btnSave").attr("disabled", true);
       return true;
    }
}

There are several vital notes to this capacity. The main is not to overlook that Asp.net as a matter of course likes to help particularly name your server controls, subsequently the "Maincontent_" prefix on our spare button. You can utilize the Clientidmode property in the event that you have to get around this. The following is that we keep the client from twofold clicking the spare catch by handicapping the catch and transforming its content to say "Handling… " Finally, we just debilitate the button if the acceptance succeeds. This keeps us from needing to handicap and re-empower the button focused around the results. Strangely it likewise verifies that our return value in the HTML component forms accurately, which was likely one of the greatest glitches I ran crosswise over amid this process.

Presently we have to wire up the Javascript handling. To do this, we utilize the Onclientclick technique that is accessible for most .Net server controls. While taking a gander at our code above looks clear enough (return false to prematurely end the script or valid to proceed with the post back) we do need to change our rationale somewhat. Having a "return genuine" explanation doesn't let the button proceed with its post back, it will make it quit handling (very nearly the same as a return false summon). Rather, we let our rationale just prematurely end if our acceptance fizzled:

<asp:Button ID="btnSave" runat="server"
            Text="Save"
            OnClick="btnSave_Click"
            OnClientClick="if (!validatePage()) {return false;}" />

At long last, following we're overriding the HTML onclick occasion on the control (on account of the Oncilentclick property) that regardless of the possibility that your acceptance strategy succeeds, the code behind system won't shoot. To work around this, we utilize the Usesubmitbehavior property of the button control and set it to false. What this does is attaches the suitable __dopostback call after our Javascript code. The last code for your button resembles this:

<asp:Button ID="btnSave" runat="server"
            Text="Save"
            OnClick="btnSave_Click"
            OnClientClick="if (!validatePage()) {return false;}"
            UseSubmitBehavior="false" />

That is all there is to it. Presently when you click on the button, if the acceptance falls flat, you'll get the caution box. Something else, the button will get to be crippled with a "handling" message and your code behind strategy will run.

This post describes the best way to upload numerous data files in ASP.NET Kinds using the jQuery and Generic Handler. Generally builders utilize the FileUpload Server management to add data files from the client device for the server that's rendered as as an Enter factor and set to file and helps you to pick out the file or various information. We can easily make use of the jQuery to help make an Ajax connect with towards the server and Submit the many picked documents for the Generic Handler as opposed to an entire webpage postback.

On this short article for creating the application, I am utilizing Visual Studio 2013 that has the framework 4.5.1. So, let us start with all the following course of action.

Creating WebForms

Step 1: Open Visual Studio and create the ASP.NET Web Application.

Step 2: Select the WebForms project template to proceed.

Visual Studio automatically creates the project and adds files and folders to the project by default.

Creating WebForm

Step 1: Just right-click on the project and add a new folder named "UploadedFiles".

Step 2: Just right-click on the project and add a new Web Form and replace the body content from the following content:

<form id="form1" runat="server">

    <h2>ASP.NET</h2>
    <p class="lead">Selcting Multiple Files using jQuery and Generic Handler</p>  

 

    <div class="form-group">
        <div>
            <asp:Label runat="server" AssociatedControlID="MultipleFilesUpload">Select Files</asp:Label>           
            <asp:FileUpload ID="MultipleFilesUpload" runat="server" AllowMultiple="true" />          

        </div>
    </div>
    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <asp:Button runat="server" ID="BtnUpload" Text="Upload Files" CssClass="btn btn-default" />
        </div>
    </div>  
 </form>

In the code above, I used the AllowMultiple property of FileUpload that is set to true. It is one of the HTML 5 features used in here.

Step 2: Now in the <head> section add the following code:

<script src="Scripts/jquery-1.10.2.js"></script>

<link href="Content/bootstrap.css" rel="stylesheet" />

<link href="Content/Site.css" rel="stylesheet" />

<script type="text/javascript">
    $(document).ready(function () {
        $("#BtnUpload").click(function (event) {
            var uploadfiles = $("#MultipleFilesUpload").get(0);
            var uploadedfiles = uploadfiles.files;
            var fromdata = new FormData();
            for (var i = 0; i < uploadedfiles.length; i++) {
                fromdata.append(uploadedfiles[i].name, uploadedfiles[i]);
            }
             var choice = {};
            choice.url = "UploadHandler.ashx";
            choice.type = "POST";
            choice.data = fromdata;
            choice.contentType = false;
            choice.processData = false;
            choice.success = function (result) { alert(result); };
            choice.error = function (err) { alert(err.statusText); };
            $.ajax(choice);
            event.preventDefault();
        });
    });
</script>

Via the code over, the data files are chosen inside the file upload handle working with the information residence of the DOM factor. the loop iterates by means of many of the information then calls the append() method of the FormData to incorporate the data files into the FormData item.

Now, the info is usually to be sent into the server. The £.ajax() is employed to transfer the information. The choice item supplies numerous options such as focus on URL and HTTP process. Now we have set the URL home on the GenericHandler file named UploadHandler.ashx . We now have established the contentType and processData home to phony with which the jQuery will not likely URL encode the info while sending into the server. The achievements and mistake properties are utilised to display the messages as a result of an warn.

Creating Generic Handler

Step 1: Add the Generic Handler by right-clicking on the project named UploadHandler.

Step 2: Modify the code with the following code:

namespace UploadMultipleFilesApp
{
    public class UploadHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            if (context.Request.Files.Count > 0)
            {
                HttpFileCollection SelectedFiles = context.Request.Files;
                for (int i = 0; i < SelectedFiles.Count; i++)
                {
                    HttpPostedFile PostedFile = SelectedFiles[i];
                    string FileName = context.Server.MapPath("~/UploadedFiles/" + PostedFile.FileName);
                    PostedFile.SaveAs(FileName);                   
                }
            }
            else
            {
                context.Response.ContentType = "text/plain";
                context.Response.Write("Please Select Files");
            }
            context.Response.ContentType = "text/plain";
            context.Response.Write("Files Uploaded Successfully!!");
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

In this article we will see which the information which might be posted to your server and will be accessed using the Ask for object. Each individual element in the HttpFileCollection is of type HttpPostedFile. FileName property is utilized to receive the file identify of posted file and return it and also the similar name id used to conserve the file.

Run WebForm

Now run the webform and choose the files as shown below that the files are selected.

After clicking on Upload Files, the message is generated.

Summary

This article explained the best way to choose numerous information and add them utilizing jQuery and Generic Handler in ASP.NET Web Forms. Joyful Coding and thanks for looking at.

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

<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

Introduction

In webapplications, one the most widely task is showing a table of information to clients. In Asp.net, we make utilization of the Datagrid, Datalist and Repeater controls. Every day, the need of showing the information will be diverse. Now, we will explain to you about "How to Create Dynamic GridView Control in C#/ASP.Net". Please read the steps carefully.

Implementing Dynamic GridView Control

Utilizing the gridview to show the articles will show the article a little in diverse layout when compared with Datalist. Appoint the below figure, Dynamic Gridview.

Constructing Dynamic GridView

Showing the articles in gridview will be different from showing in datalist. For that, i have made two Template classes :

• DynamicGridViewTextTemplate
• DynamicGridViewURLTemplate

TemplateClass for GridView

Using the Template Class in GridView