ASP.NET

<asp:ScriptManager ID="ScriptManager1" runat="server">
    <Scripts>
        <asp:ScriptReference Path="~/scripts/datepickerjs/jquery-1.3.1.min.js" />
        <asp:ScriptReference Path="~/scripts/datepickerjs/jquery-ui-1.7.1.custom.min.js" />
        <asp:ScriptReference Path="~/scripts/datepickerjs/daterangepicker.jQuery.js" />
    </Scripts>
</asp:ScriptManager>

<link rel="Stylesheet" type="text/css" href="style/datepickercss/ui.daterangepicker.css" />
<link rel="Stylesheet" type="text/css" href="style/datepickercss/redmond/jquery-ui-1.7.1.custom.css" title="ui-theme" />

<script type="text/jscript">
    $(function() {
        $("#txtDateFrom").datepicker({
            changeMonth: true,
            changeYear: true,
            buttonText: 'Select Date From',
            buttonImage: 'images/calendar.gif',
            buttonImageOnly: true,
            showOn: 'button'
        });
    });

    $(function() {
        $("#txtDateTo").datepicker({
            changeMonth: true,
            changeYear: true,
            buttonText: 'Select Date To',
            buttonImage: 'images/calendar.gif',
            buttonImageOnly: true,
            showOn: 'button'
        });
    });
</script>

The state information is invalid for this page and might be corrupted.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The state information is invalid for this page and might be corrupted.

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MainMaster.master.cs" Inherits="MainMaster" EnableViewState="false"  %>

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    GridViewRow gv ;
    gv =GridView1.SelectedRow;
    if (gv.Cells[4].Text == "KS")
    {
        if (gv.RowType == DataControlRowType.DataRow)
        {
            CheckBox chkDelete = (CheckBox)gv.Cells[0].Controls[0];
            chkDelete.Enabled = false;
        }
    }

}