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Object reference not set to an instance of an object.

Posted on 2006-06-29
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Last Modified: 2008-01-09
Hello,

i am using the infragistics web tree controled and on my page load I am having  this error
Object reference not set to an instance of an object. the line that is causing it is below

igTree.Nodes[0].Selected =true ;

here is my page_load code
 protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            lblId.Text = Request["ParentTitle"];
                               
             LoadTree(Request["ParentTitle"]);
            igTree.Nodes[0].Selected =true ;
           
            PopulateUnassignedData();
                                   
         }
         AdminID = Session["admin_id"].ToString();
     }
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Question by:jemigossaye
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3 Comments
 
LVL 25

Accepted Solution

by:
dstanley9 earned 300 total points
ID: 17012562
then either igTree or igTree.Nodes[0] is null.  Run it in the debugger and see which is null.  What is the code for LoadTree?
0
 
LVL 12

Assisted Solution

by:topdog770
topdog770 earned 200 total points
ID: 17012640
Yeah... it's likely that even if you are do a igTree = new 'WhatEverTheObjectNameIs'
that the nodes haven't been added the first time into the page.

Without seeing the code behind this.. I'd think that you will either need to add the node, first, OR make sure that the LoadTree function is working the way it's supposed to prior to setting the Selected value to true..

Simple check.. that may not provide the functionality you need long term would be to do something like this...

if( igTree != null && igTree.Nodes != null && igTree.Nodes.Count > 0 )
      igTree.Nodes[0].Selected =true ;

0
 

Author Comment

by:jemigossaye
ID: 17012737
okay thanks I had done some major damage to myself the loadtree was not retruning any values rather i wasn't retruning my dataset. what a day


thanks all
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