Asp.net - FindControl For Nested Controls In UserControl Returns Null?

Aug 31, 2010

I have a UserControl that has some controls inside. I want to refer those controls after, in another postback. But when I try to get them the Controls property of my controls returns null. I'm working on vs2008.

Here is the sample code:

[code]....

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[Code]....

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[code]....

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[Code]....

CODE-BEHIND

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[Code]....

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{
GridView1.DataBind();
}
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e.NewValues["archived"] = isarchive.Checked;
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[Code]....

and here is how I am feeding the DataGrid:

[Code]....

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here is my treeView [Code]....

Code behind to save values in session on Page_Load:

[Code]....

Code behind to select TreeNode after return from other page on PageLoad

[Code]....

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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Projects.aspx.vb" Inherits="Projects" %>
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[code]....

I guess something might be getting messy with the mode changing event... a postback? But if i remove the databinding code, i get an error! why find control returns null??

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[Code]....

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[code]....

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<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WC2.ascx.cs" Inherits="WebApplication1.WC2" %>

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myclass = new Class1();...........

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[code]....

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[Code]....

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Code in class that calls this SP :

[Code]....

So I switched code to the following in my dbml.layout document :

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[Code]....

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Oct 20, 2010

Nested GridView Control returns "Object variable or With block variable not set" when outer GridView returns rows.

The Nested GridView Control works as long as the outer GridView returns rows, the following code works: [Code]....

Object variable or With block variable not set.

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 variable or With block variable not set.

Source Error:

Line 118: If e.Row.RowType = DataControlRowType.DataRow Then
Line 119: Dim myStatus_ID As SqlDataSource = CType(e.Row.FindControl("sqlDeviceStatusAssign"), SqlDataSource)
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*Dim localLblItemReference As Label = CType(e.Row.FindControl("lblItemReference"), Label)

*If Not localLblItemReference Is Nothing Then

******************************************************************************************

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Exception Details: System.NullReferenceException: Object variable or With block variable not set.

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