移动窗体

如何移动没有Title的窗体。
private void label1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
mouse_offset = new Point(-e.X, -e.Y);
}
private void label1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
Point mousePos = Control.MousePosition;
mousePos.Offset(mouse_offset.X, mouse_offset.Y);
Location = mousePos; } }