Question

protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
    string input = TreeView1.SelectedValue.ToString();
    DataSet ds = new DataSet();
    TreeLogic bl = new TreeLogic();
    TreeNode root= new TreeNode(input);
    ds = bl.getChild(input);
    for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
    {
        TreeNode tnode = new TreeNode(ds.Tables[0].Rows[i][1].ToString());
        tnode.SelectAction = TreeNodeSelectAction.Expand;
        root.ChildNodes.Add(tnode);
    }
}

Child nodes not displays when i select parent node. Can any one tell why?

Answer 1

Edit: If you are trying to add those new nodes as children of the selected node, you’re doing it wrong =) You need to do this:

for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
    TreeNode tnode = new TreeNode(ds.Tables[0].Rows[i][1].ToString());
    tnode.SelectAction = TreeNodeSelectAction.Expand;
    // Add the new TreeNodes underneath the currently selected TreeNode.
    TreeView1.SelectedNode.ChildNodes.Add(tnode);
}
TreeView1.SelectedNode.Expand();