problem to showing key node of treeview

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C#

Hi,

I need my key nodes tree, but I can't find them.
I use this source code, but its result is a empty msgbox, that have just an ok button.
Please help me:

private TreeNode Create_Tree(string Key, string Name)
{
      TreeNode tr = new TreeNode(Name);

      for (int i = 0; i < dataGridViewSub.Rows.Count; i++)
      {
           try
           {
               if (
                     (dataGridViewSub.Rows[i].Cells[2].Value.ToString() == Key)
                        &&
                        (dataGridViewSub.Rows[i].Cells[1].Value.ToString() != "1000")
                     )
                  {
                        tr.Nodes.Add(
                            Create_Tree(dataGridViewSub.Rows[i].Cells[1].Value.ToString(),
                                dataGridViewSub.Rows[i].Cells[5].Value.ToString()));
                    }
                }
                catch (Exception ex)
                {
                }
            }
            return tr;
        }

Calling my function:

treeView1.Nodes.Clear();

if (dataGridViewSub.Rows.Count > 0)
      treeView1.Nodes.Add(Create_Tree(dataGridViewSub.Rows[0].Cells[1].Value.ToString(), dataGridViewSub.Rows[0].Cells[5].Value.ToString()));

And showing key:

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
      MessageBox.Show(treeView1.SelectedNode.Name);
}

Thanks