c#鼠标右键单击事件怎么写

 private void Form1_MouseDown(object sender, MouseEventArgs e)
 {
  //按鼠标右键，弹出菜单   
  if (e.Button == System.Windows.Forms.MouseButtons.Right)
  {
    contextMenuStrip1.Show(PointToScreen(e.Location));
  }
}

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