Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster

Solution:

Put

<system.web>
  <pages viewStateEncryptionMode="Always" />
</system.web>
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Calling Content Page Method from MasterPage Method

You can do this using Delegates.

For Example, you have a button in MasterPage and you want to call a Method in Content Page from Master Page. Here is the Code in Master Page.

Master Page:

public partial class MasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (contentCallEvent != null)
            contentCallEvent(this, EventArgs.Empty);
    }
    public event EventHandler contentCallEvent;
}

Content Page:

public partial class Content_1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    private void Master_ButtonClick(object sender, EventArgs e)
    {
        // This Method will be Called.
    }
    protected void Page_PreInit(object sender, EventArgs e)
    {
        // Create an event handler for the master page's contentCallEvent event
        Master.contentCallEvent += new EventHandler(Master_ButtonClick);
    }
}

And Also add the Below Line Specifying you MasterPage Path in VirtualPath

<%@ MasterType VirtualPath="~/MasterPage.master" %> 
// This is Strongly Typed Reference

how to disable previous dates in CalendarExtender control through its render event?

head runat="server">
    <title>Calendar Extender</title>
    <script type="text/javascript">
    function checkDate(sender,args)
{
 if (sender._selectedDate < new Date())
            {
                alert("You cannot select a day earlier than today!");
                sender._selectedDate = new Date(); 
                // set the date back to the current date
sender._textbox.set_Value(sender._selectedDate.format(sender._format))
            }
}
    </script>
</head>

Call the code:

<form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div>

            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <cc1:CalendarExtender ID="CalendarExtender1"
            runat="server" OnClientDateSelectionChanged="checkDate" TargetControlID="TextBox1" />

        </div>
    </form>

Ajax Toolkit Error: Could not find any resources appropriate for the specified culture or the neutral culture. Make sure “AjaxControlToolkit.Properties.Resources.NET4.resources” was correctly embedded or linked into assembly “AjaxControlToolkit” at compile time, or that all the satellite assemblies required are loadable and fully signed.

Error Message:

Could not find any resources appropriate for the specified culture or the neutral culture.  Make sure “AjaxControlToolkit.Properties.Resources.NET4.resources” was correctly embedded or linked into assembly “AjaxControlToolkit” at compile time, or that all the satellite assemblies required are loadable and fully signed.

Reason:

AjaxControlToolkit’s control load reference refers to the base System.Web.UI.Control method which is present as a part of the ASP.NET AJAX Libraries and those libraries are referenced only when the ScriptManager is referenced in the page.

Solution:

Add ScriptManager in the page and this error would be resolved.

            <asp:ScriptManager ID="ScriptManager1" runat="server">
            </asp:ScriptManager>