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Error in web app

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Grid

This is a migrated thread and some comments may be shown as answers.

Rufus asked on 28 Apr 2011, 05:02 AM

I have simple page in Net 4.0 and getting below error and below you will the code as well

Object reference not set to an instance of an object.

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.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


            [NullReferenceException: Object reference not set to an instance of an object.]
   Telerik.Web.UI.PreControlToAjaxify.Render(HtmlTextWriter writer) +113
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +245
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +245
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +306
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +47
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +245
   System.Web.UI.Page.Render(HtmlTextWriter writer) +39
   Telerik.Web.UI.RadAjaxControl.RenderPageInAjaxMode(HtmlTextWriter writer, Control page) +666
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
   System.Web.UI.Page.Render(HtmlTextWriter writer) +39
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4942

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Code:
Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</form>
</body>
</html>

Default.aspx.cs:

using System;

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

}
}

WebUSerControl.acsx:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>
<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
<telerik:RadAjaxManagerProxy ID="AjaxManagerProxy1" runat="server">
    <AjaxSettings>
    <telerik:AjaxSetting AjaxControlID="OrdersGrid">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="OrdersGrid" />
            </UpdatedControls>
        </telerik:AjaxSetting>
        <telerik:AjaxSetting AjaxControlID="EmployeesGrid">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="RadTabStrip1" />
                <telerik:AjaxUpdatedControl ControlID="RadMultiPage1" LoadingPanelID="RadAjaxLoadingPanel1" />
                <telerik:AjaxUpdatedControl ControlID="EmployeesGrid" />
            </UpdatedControls>
        </telerik:AjaxSetting>

    </AjaxSettings>

</telerik:RadAjaxManagerProxy>

<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" />
<telerik:RadGrid ID="EmployeesGrid" runat="server" AutoGenerateColumns="true"
    AllowSorting="True" AllowMultiRowSelection="False" AllowPaging="True" PageSize="5"
    GridLines="None" ShowStatusBar="true" style="margin-bottom: 20px;">
    <PagerStyle Mode="NumericPages"></PagerStyle>

<telerik:RadTabStrip runat="server" ID="RadTabStrip1" MultiPageID="RadMultiPage1"
    SelectedIndex="0">
    <Tabs>
        <telerik:RadTab runat="server" Text="Sanjay" PageViewID="PageView1" />
        <telerik:RadTab runat="server" Text="Sanjay" PageViewID="PageView2" />
    </Tabs>
</telerik:RadTabStrip>
<telerik:RadMultiPage runat="server" ID="RadMultiPage1" SelectedIndex="0" RenderSelectedPageOnly="false">
    <telerik:RadPageView runat="server" ID="PageView1">
    <telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="true"
    AllowSorting="True" AllowMultiRowSelection="False" AllowPaging="True" PageSize="5"
    GridLines="None" ShowStatusBar="true" style="margin-bottom: 20px;">
    <PagerStyle Mode="NumericPages"></PagerStyle>

WebUserControl.acxs.cs:

using System;
using System.Data;

public partial class WebUserControl : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable dt = new DataTable();

dt.Columns.Add(new DataColumn("Contract Number", typeof(string)));

dt.Columns.Add(new DataColumn("Customer Name", typeof(string)));

DataRow dr = dt.NewRow();

dr["Customer Name"] = "Sanjay";
dr["Contract Number"] = "Sanjay";

dt.Rows.Add(dr);

        EmployeesGrid.DataSource = dt;
        EmployeesGrid.DataBind();

}
}

2 Answers, 1 is accepted

answered on 02 May 2011, 03:01 PM

TestPage.rar

Hello,

I tried to replicate the described issue locally using your code but to no avail. Please find attached a sample runnable example which works correctly on our site.
We are not aware of such an issue with Telerik 2008q2 RadAjaxManager and does not have reports for this problem till now. Could you please let me know if the error appear when the Ajax is disable on the page? Also please let me know what the application behaviour is if regular asp UpdatePanel is used on the page instead of RadAjax.

Regards,
Maria Ilieva
the Telerik team

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