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Script error for some users but not for others

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Ajax

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

James O'Brien asked on 10 Nov 2010, 05:16 PM

Some users are getting the following script errors when trying to add or edit. But I'm not getting it from the server or running it in Visual Studio 2010. Please see the code below and help.

Error:

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MDDR; InfoPath.2; .NET CLR 1.1.4322; .NET4.0C; .NET4.0E; MS-RTC LM 8)

Timestamp: Wed, 10 Nov 2010 15:48:23 UTC

Message: Sys.WebForms.PageRequestManagerServerErrorException: Object reference not set to an instance of an object.

Line: 3

Char: 74672

Code: 0

URI: http://10.137.12.91/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=cphAdmin_cphCMS_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bAjaxControlToolkit%2c+Version%3d4.1.40412.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d28f01b0e84b6d53e%3aen-US%3aacfc7575-cdee-46af-964f-5d85d9cdcf92%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2010.2.929.40%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a183fb741-216d-4765-9b46-4a1f5d38fdd7%3a16e4e7cd%3aed16cbdc%3a58366029%3ab7778d6c%3af7645509%3a8674cba1%3ac08e9f8a%3aa51ee93e%3a59462f1

<%@ Page Title="NextGen Portal : Home Page Quick Links" Language="C#" MasterPageFile="~/themes/CMS.master" AutoEventWireup="true" CodeFile="HomeQuickLinks.aspx.cs" Inherits="CMS_HomeQuickLinks" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<asp:Content ID="Content1" ContentPlaceHolderID="cphheaderCMS" Runat="Server"></asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="cphCMS" Runat="Server">

<h1>Home Page Quick Link</h1>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">

<telerik:RadGrid

ID="gridQL"

runat="server"

AutoGenerateColumns="false"

OnItemCommand="RadGrid_ItemCommand"

Height="300"

OnItemDataBound="RadGrid_ItemDataBound"

OnRowDrop="grdPendingOrders_RowDrop">

<MasterTableView DataKeyNames="HomeQuickLinkID">

<Columns>

<telerik:GridBoundColumn DataField="HomeQuickLinkID" Display="false"></telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="LinkTitle" HeaderText="Link Title"></telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="LongShowDate" HeaderText="Show Date"></telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="LongUpdatedDate" HeaderText="Last Updated"></telerik:GridBoundColumn>

<telerik:GridBoundColumn DataField="UpdatedName" HeaderText="Last Updated By"></telerik:GridBoundColumn>

<telerik:GridButtonColumn ButtonType="LinkButton" Text="Move Up" CommandName="UpQL"><ItemStyle Width="50px"></ItemStyle></telerik:GridButtonColumn>

<telerik:GridButtonColumn ButtonType="LinkButton" Text="Move Down" CommandName="DownQL"><ItemStyle Width="70px"></ItemStyle></telerik:GridButtonColumn>

<telerik:GridButtonColumn ButtonType="LinkButton" Text="Edit" CommandName="EditQL"></telerik:GridButtonColumn>

<telerik:GridButtonColumn ButtonType="LinkButton" Text="Delete" CommandName="DeleteQL"></telerik:GridButtonColumn>

</Columns>

</MasterTableView>

<ClientSettings EnablePostBackOnRowClick="true" AllowRowsDragDrop="false">

<Selecting AllowRowSelect="True" UseClientSelectColumnOnly="true"/>

</ClientSettings>

</telerik:RadGrid>

<br />

<asp:HiddenField ID="hideID" runat="server" />

<table id="entrySettings">

<tr>

<td class="label">Title: </td>

<td>

<telerik:RadTextBox

ID="txtLinkTitle"

runat="server"

Width="400"

MaxLength="400"

ValidationGroup="HomeQuickLink"></telerik:RadTextBox>

<asp:RequiredFieldValidator

ID="RequiredLinkTitle"

runat="server"

ValidationGroup="HomeQuickLink"

ControlToValidate="txtLinkTitle"

ErrorMessage="Link Title can not be blank!"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td class="label">Link: </td>

<td>

<telerik:RadTextBox

ID="txtLinkURL"

runat="server"

Width="400"

MaxLength="400"></telerik:RadTextBox>

<asp:RequiredFieldValidator

ID="RequiredLinkURL"

runat="server"

ValidationGroup="HomeQuickLink"

ControlToValidate="txtLinkURL"

ErrorMessage="Link Title can not be blank!"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td class="label" id="FieldLabel">Show Date:</td>

<td>

<telerik:RadDatePicker ID="dateShowDate" runat="server"></telerik:RadDatePicker>

<asp:RequiredFieldValidator

ID="RequiredShowDate"

runat="server"

ErrorMessage="Please enter the show date!"

ControlToValidate="dateShowDate"

Display="Dynamic"

ValidationGroup="HomeQuickLink"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td class="label">Created: </td>

<td><asp:Label

ID="lblCreated"

runat="server"></asp:Label>

</td>

</tr>

<tr>

<td class="label">Updated: </td>

<td><asp:Label

ID="lblUpdated"

runat="server"></asp:Label>

</td>

</tr>

</table>

<div style="text-align:right">

<asp:Button

ID="btnAdd"

runat="server"

Text="Add"

ValidationGroup="HomeQuickLink"

onclick="btnAdd_Click" />

<asp:Button

ID="btnUpdate"

runat="server"

Text="Update"

onclick="btnUpdate_Click"

ValidationGroup="HomeQuickLink"

Visible="false" />

<asp:Button

ID="btnClear"

runat="server"

Text="Clear"

onclick="btnClear_Click" />

</div>

</telerik:RadAjaxPanel>

</asp:Content>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using Telerik.Web.UI;

public partial class CMS_HomeQuickLinks : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

LoadGrid();

}

public void LoadGrid()

{

gridQL.DataSource = new List<string>(0);

gridQL.DataBind();

gridQL.DataSource = NextGen.core.CMS.HomeQuickLinkManager.GetList();

gridQL.DataBind();

}

protected void btnAdd_Click(object sender, EventArgs e)

{

NextGen.core.CMS.HomeQuickLink QL = new NextGen.core.CMS.HomeQuickLink();

NextGen.core.CMS.HomeQuickLinkManager m = new NextGen.core.CMS.HomeQuickLinkManager();

QL.LinkTitle = txtLinkTitle.Text;

QL.LinkURL = txtLinkURL.Text;

QL.ShowDate = (DateTime)dateShowDate.SelectedDate;

QL.CreatedID = Int32.Parse(Session["ProfileID"].ToString());

m.Add(QL);

LoadGrid();

ClearFields();

}

protected void btnUpdate_Click(object sender, EventArgs e)

{

NextGen.core.CMS.HomeQuickLink QL = new NextGen.core.CMS.HomeQuickLink();

NextGen.core.CMS.HomeQuickLinkManager m = new NextGen.core.CMS.HomeQuickLinkManager();

QL.HomeQuickLinkID = Int32.Parse(hideID.Value);

QL.LinkTitle = txtLinkTitle.Text;

QL.LinkURL = txtLinkURL.Text;

QL.ShowDate = (DateTime)dateShowDate.SelectedDate;

QL.UpdatedID = Int32.Parse(Session["ProfileID"].ToString());

m.Edit(QL);

LoadGrid();

ClearFields();

}

public void ClearFields()

{

hideID.Value = "";

txtLinkTitle.Text = "";

txtLinkURL.Text = "";

dateShowDate.Clear();

lblCreated.Text = "";

lblUpdated.Text = "";

LoadGrid();

btnAdd.Visible = true;

btnUpdate.Visible = false;

}

protected void RadGrid_ItemCommand(object source, GridCommandEventArgs e)

{

ClearFields();

int QLID = (int)e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["HomeQuickLinkID"];

if (e.CommandName == "RowClick" || e.CommandName == "EditQL")

GetQL4Edit(QLID);

if (e.CommandName == "DeleteQL")

{

NextGen.core.CMS.HomeQuickLinkManager m = new NextGen.core.CMS.HomeQuickLinkManager();

m.Remove(QLID);

ClearFields();

}

if (e.CommandName == "UpQL")

{

NextGen.core.CMS.HomeQuickLinkManager m = new NextGen.core.CMS.HomeQuickLinkManager();

m.OrderUp(QLID);

LoadGrid();

}

if (e.CommandName == "DownQL")

{

NextGen.core.CMS.HomeQuickLinkManager m = new NextGen.core.CMS.HomeQuickLinkManager();

m.OrderDown(QLID);

LoadGrid();

}

protected void RadGrid_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)

{

//if (e.Item is GridDataItem)

//{

// foreach (GridDataItem item in gridAnnouncements.MasterTableView.Items)

// {

// if (item.ItemIndex == 0)

// {

// LinkButton btn = (LinkButton)item["UpAnnouncement"].Controls[0];

// btn.Visible = false;

// item.Display = false;

// break; //terminates the for loop

// }

//}

}

public void GetQL4Edit(int intID)

{

NextGen.core.CMS.HomeQuickLink QL = NextGen.core.CMS.HomeQuickLinkManager.GetRecord(intID);

hideID.Value = intID.ToString();

txtLinkTitle.Text = QL.LinkTitle;

txtLinkURL.Text = QL.LinkURL;

dateShowDate.SelectedDate = QL.ShowDate;

lblCreated.Text = QL.CreatedName + " on " + QL.CreatedDate.ToShortDateString() + " " + QL.CreatedDate.ToShortTimeString();

lblUpdated.Text = QL.UpdatedName + " on " + QL.UpdatedDate.ToShortDateString() + " " + QL.UpdatedDate.ToShortTimeString();

btnAdd.Visible = false;

btnUpdate.Visible = true;

}

protected void btnClear_Click(object sender, EventArgs e)

{

ClearFields();

}

protected void grdPendingOrders_RowDrop(object sender, GridDragDropEventArgs e)

{

//int o = 0;

//NextGen.core.CMS.HomeQuickLinkManager m = new NextGen.core.CMS.HomeQuickLinkManager();

//foreach (GridDataItem i in e.[ReorderedItemsLists])

//{

// o = o + 1;

// m.EditOrder((int)draggedItem.GetDataKeyValue("HomeQuickLinkID"), o);

//}

//LoadGrid();

}

6 Answers, 1 is accepted

answered on 11 Nov 2010, 02:28 PM

Hi James,

You should take into consideration the difference between Advanced databinding and Simple databinding for the RadGrid control and rework your code along the lines of the former. Whenever you need to populate the grid with new data, assign its DataSource property and call its Rebind() (not DataBind() ) method.

Hope this information helps.

Regards,
Tsvetoslav
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items

answered on 22 Dec 2010, 10:10 PM

Hi Craig,

Thank you for contacting us.

The mentioned error mostly appears if the same part of the page is updated with the both RadAjaxManager and RadAjaxPanel at the same time. Please note that using both ajax controls (RadAjaxManager and RadAjaxPanel for updating the same content on the page is not supported scenario. Adding RadAjaxPanel into the RadAjaxManager settings may lead to a lot of different issue.
I hope this helps.

Best wishes,
Maria Ilieva
the Telerik team

Browse the vast support resources we have to jump start your development with RadControls for ASP.NET AJAX. See how to integrate our AJAX controls seamlessly in SharePoint 2007/2010 visiting our common SharePoint portal.