It might sound like a dumb quesiton, however i cant access a treeview node from another event handler or page load method!

Is there anything I have to add to the page load method for example to have access to the nodes in treeview?

You should be able to access the treeview node from other event handlers

Please visit the following URL:

http://quickstarts.asp.net/QuickStartv20/util/srcview.aspx?path=~/aspnet/samples/ctrlref/navigation/TreeView/TreeView07.src

 It  explains how to access the tree nodes inside a button onclick event

I still cant access nodes in my treeview.

Let me explain more: i just want to expand or collapse nodes based on a drop down Selected index change. I thought the "Find Node" method for treeview and then "Expand" will do the job but it gives me errors.

Any suggestion?

Hi,

Reza2011:

Let me explain more: i just want to expand or collapse nodes based on a drop down Selected index change. I thought the "Find Node" method for treeview and then "Expand" will do the job but it gives me errors.

You can use the find node method to find the node, the treenode's valuepath as the parameter. Like below code:

 protected void lbClose_Click(object sender, EventArgs e)
    {

        TreeNode tn = this.TreeView1.FindNode("Home/School"); // the school treenode

        if (tn.Expanded == true)
        {
            this.TreeView1.CollapseAll();

            this.lbClose.Text = "open";
        }
        else
        {
            this.TreeView1.ExpandAll();

            this.lbClose.Text = "Close";
        }
    }

Hope it helps.