troubleshooting Question

Object reference not set to an instance of an object.

Avatar of webdevelop
webdevelop asked on
ASP.NETVisual Basic.NET
8 Comments3 Solutions293 ViewsLast Modified:
In the code behind shown (.aspx page included as well), NextLink.Visible = false (Line 16) is giving the following error:

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

I assume that is occuring b/c the LinkButton is inside of the <HeaderTemplate> on a repeater... Is there any way to keep the LinkButtons inside the HeaderTemplate?  If so, please provide code required.

Thanks!
Public Class PagingCodeBehind
 
Inherits Page
 
...Edited...
Protected FirstLink As LinkButton
Protected PreviousLink As LinkButton
Protected NextLink As LinkButton
Protected LastLink As LinkButton
...Edited...
Sub Paging(Optional WhichPage As Integer = 1,Optional 
 
' If current page is the last page, hide the "next" and "last" navigation links
If CurrentPage = Pages Then
	
	NextLink.Visible = false
	LastLink.Visible = false
	
' Otherwise, show the "next" and "last" navigation links and set the page index each will pass when clicked
Else
	
	NextLink.Visible = true
	LastLink.Visible = true
	NextLink.CommandArgument = CurrentPage + 1
	LastLink.CommandArgument = Pages
	
End If
...Edited...
 
End Sub
=======================================
Index page:
<form runat="server">
 
<asp:Repeater
  ID="myRepeater"
  Runat="server"
  OnItemCreated="myRepeater_ItemCreated">
 
<HeaderTemplate>                        
...Edited...
<asp:LinkButton runat="server" ID="NextLink" Text="Next &raquo;" onClick="ChangePage" />
<asp:LinkButton runat="server" ID="LastLink" Text="Last &raquo;" onClick="ChangePage" />
...Edited...
</HeaderTemplate>
                            
<ItemTemplate>
...Edited...
</ItemTemplate>
                        
<FooterTemplate>
</table>
</FooterTemplate>
                        
</asp:Repeater>
</form>
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