Question

I have been working on this for a while, but cannot resolve the issue. I have searched S/O & Google, but no luck. Hoping someone on here can help resolve this.

I am not able to display the child nodes in my TreeView control. The data is being retrieved from a database.
The root node appears fine, but there are not child nodes displayed. How can I get the child nodes to be displayed?

My code is:

private void PopulateTreeNode(DataSet dsList)
{
    var treeNode = new TreeNode();
    foreach (DataRow dr in dsList.Tables[0].Rows)
    {
        if (dr["RecordTypeID"].ToString() == "1")
        {
            TreeNode NewNode = new TreeNode(dr["CustomerName"].ToString(), dr["customerID"].ToString());
            treeCustomer.Nodes.Add(NewNode);
        }
        else if (dr["RecordTypeID"].ToString() == "2")
        {
            TreeNode pNode = new TreeNode(dr["CustomerName"].ToString(), dr["customerID"].ToString());
            pNode.ChildNodes.Add(pNode);
        }
        else if (dr["RecordTypeID"].ToString() == "3")
        {
            TreeNode pNode = new TreeNode(dr["CustomerName"].ToString(), dr["customerID"].ToString());
            pNode.ChildNodes.Add(pNode);
        }
    }
    treeCustomer.Nodes.Add(treeNode);
    treeCustomer.DataBind();
}

Answer 1

You don’t need to call treeCustomer.DataBind() if you are manually adding nodes like this. It is probably clearing out your tree.