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Object Reference not set to an instance of an object

5 Answers 673 Views

Grid

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

Jeevan asked on 14 May 2013, 01:01 PM

Hi,
We are getting the below error in one of the environment, we are using RadGridControl.
Below is the stacktrace, any help would be appreciated.
Thanks.

[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.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

System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +50

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.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +50

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4942

5 Answers, 1 is accepted

answered on 15 May 2013, 10:33 AM

Hi Princy,
The issue that we are facing is specific to an environment, part of trouble shooting the actual issue, we have created the below test page, it doesn't have any code behind or binding logic, we are just using the RadGrid control in the aspx page. This page loads fine in the Dev box but getting the mentioned error in one of the environment.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="TRADSample.WebForm1" %>

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

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

<title>TEST</title>

<style type="text/css">

div.log {

border: silver 1px solid; background-color: white; padding: 3px 10px 3px 10px;

}

div.log .left {

float: left; font-weight: bold; font-size: 125%;

}

div.log .right {

float: right; font-weight: bold;

}

div.log .text {

overflow:auto; max-height: 200px; width: 100%; padding: 0px 10px 0px 0px;

}

</style>

</head>

<body>

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

<telerik:RadScriptManager runat="server" ID="RadScriptManager" />

<telerik:RadAjaxManager ID="RadAjaxManager" runat="server" DefaultLoadingPanelID="LoadingPanel">

<AjaxSettings>

<telerik:AjaxSetting AjaxControlID="rgdActivitySummary">

<UpdatedControls>

<telerik:AjaxUpdatedControl ControlID="rgdActivitySummary" />

</UpdatedControls>

</telerik:AjaxSetting>

</AjaxSettings>

</telerik:RadAjaxManager>

<telerik:RadAjaxLoadingPanel ID="LoadingPanel" runat="server"></telerik:RadAjaxLoadingPanel>

<h1><asp:Label ID="lblActivity" runat="server"></asp:Label></h1>

<telerik:RadGrid ID="rgdSummary" runat="server" DataMember="ActivitySummary" AllowSorting="false" ShowHeader="false" BorderStyle="None">

<MasterTableView DataKeyNames="ActivityLogID">

<ItemStyle BackColor="#EEF0F6" ForeColor="#333333" />

<AlternatingItemStyle BackColor="#EEF0F6" ForeColor="#333333" />

<SortExpressions>

<telerik:GridSortExpression FieldName="CreatedOn" SortOrder="Descending"></telerik:GridSortExpression>

</SortExpressions>

<Columns>

<telerik:GridTemplateColumn HeaderText="ActivityLog" UniqueName="ActivityLog">

<ItemTemplate>

<div class="log">

<span class="left">

<%# String.Format("{0:MMM dd yyyy HH:mm} - {1}", DataBinder.Eval(Container.DataItem, "CreatedOn"), DataBinder.Eval(Container.DataItem, "LogType"))%>

</span>

<span class="right">

<%if (SolType == 0) {%>

<%# string.Format("CreatedBy" + " {0} | " + "PerformedBy" + " {1}<br /> <br />", DataBinder.Eval(Container.DataItem, "CreatedBy"), DataBinder.Eval(Container.DataItem, "PerformedBy"))%>

<% } else {%>

<%# string.Format("CreatedBy" + " {0} | " + "PerformedBy"+ " {1}<br

/>" + "BillableTimeAS"+ " {2}", DataBinder.Eval(Container.DataItem, "CreatedBy"), DataBinder.Eval(Container.DataItem, "PerformedBy"), Convert.ToInt32(DataBinder.Eval(Container.DataItem, "BillableMinutes")))%>

<% } %>

</span>

<div class="text"><%# DataBinder.Eval(Container.DataItem, "LogText").ToString().Replace("\n", "<br />") %></div>

</div>

</ItemTemplate>

</telerik:GridTemplateColumn>

</Columns>

</MasterTableView>

</telerik:RadGrid>

</form>

</body>

</html>

answered on 15 May 2013, 10:35 AM

Having trouble providing the code in this forum, tried couple of times to post the code but some reason not getting displayed here.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="TRADSample.WebForm1" %>

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

div.log {

border: silver 1px solid; background-color: white; padding: 3px 10px 3px 10px;

}

div.log .left {

float: left; font-weight: bold; font-size: 125%;

}

div.log .right {

float: right; font-weight: bold;

}

div.log .text {

overflow:auto; max-height: 200px; width: 100%; padding: 0px 10px 0px 0px;

}

</style>

</head>

<body>

<telerik:RadScriptManager runat="server" ID="RadScriptManager" />

<telerik:RadAjaxManager ID="RadAjaxManager" runat="server" DefaultLoadingPanelID="LoadingPanel">

<telerik:AjaxSetting AjaxControlID="rgdActivitySummary">

<telerik:AjaxUpdatedControl ControlID="rgdActivitySummary" />

</UpdatedControls>

</telerik:AjaxSetting>

</AjaxSettings>

</telerik:RadAjaxManager>

<telerik:RadAjaxLoadingPanel ID="LoadingPanel" runat="server"></telerik:RadAjaxLoadingPanel>

<telerik:RadGrid ID="rgdSummary" runat="server" DataMember="ActivitySummary" AllowSorting="false" ShowHeader="false" BorderStyle="None">

<telerik:GridSortExpression FieldName="CreatedOn" SortOrder="Descending"></telerik:GridSortExpression>

</SortExpressions>

<telerik:GridTemplateColumn HeaderText="ActivityLog" UniqueName="ActivityLog">

<%# String.Format("{0:MMM dd yyyy HH:mm} - {1}", DataBinder.Eval(Container.DataItem, "CreatedOn"), DataBinder.Eval(Container.DataItem, "LogType"))%>

</span>

<%if (SolType == 0) {%>

<%# string.Format("CreatedBy" + " {0} | " + "PerformedBy" + " {1}<br /> <br />", DataBinder.Eval(Container.DataItem, "CreatedBy"), DataBinder.Eval(Container.DataItem, "PerformedBy"))%>

<% } else {%>

<%# string.Format("CreatedBy" + " {0} | " + "PerformedBy"+ " {1}<br />" + "BillableTimeAS"+ " {2}", DataBinder.Eval(Container.DataItem, "CreatedBy"), DataBinder.Eval(Container.DataItem, "PerformedBy"), Convert.ToInt32(DataBinder.Eval(Container.DataItem, "BillableMinutes")))%>

<% } %>

</span>

</div>

</ItemTemplate>

</telerik:GridTemplateColumn>

</Columns>

</MasterTableView>

</telerik:RadGrid>

</form>

</body>

</html>

answered on 20 May 2013, 07:22 AM

Hello,

Most probably the problem comes from the IDs of the RadScriptManager and RadAjaxManager controls you have set. The ID of these controls is the same as the name of the control class. In this case when you write in the code editor "RadScriptManager" to what are you referring to the class or to the instance? How the compiler should know?

Try to add one digit in the end of the IDs and check whether the issue would still replicate.

Kind regards,
Andrey
the Telerik team

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