C# - nodo seleccionado bajo menú de contexto

void treeView1MouseUp(object sender, MouseEventArgs e)
{
if(e.Button == MouseButtons.Right)
{
	   treeView1.SelectedNode = treeView1.GetNodeAt(e.X, e.Y);
    if(treeView1.SelectedNode != null)
    {
		   myContextMenuStrip.Show(treeView1, e.Location);
    }
}
}