void TreeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
if (TreeView1.SelectedNode.Index == 0)
{
Panel1.Visible = true;
Panel2.Visible = false;
TreeView1.Focus();
}
else if (TreeView1.SelectedNode.Index == 1)
{
Panel1.Visible = false;
Panel2.Visible = true;
TreeView1.Focus();
}
}