鼠标点击按钮拖动窗体

public partial class Form1 : Form {
//记录窗体的X坐标
private int startX;
//记录窗体的Y坐标
private int startY;

  public Form1() {
	InitializeComponent();
	}
	/// <summary>
	/// 鼠标点击左键
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="e"></param>
	private void button1_MouseDown(object sender, MouseEventArgs e) {
		//判断点击的是不是左键
		if(e.Button == MouseButtons.Left) {
			//得到窗体的X值
			startX = e.X;
			//得到窗体的Y值
			startY = e.Y;
		}
	}
	/// <summary>
	/// 鼠标移动
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="e"></param>
	private void button1_MouseMove(object sender, MouseEventArgs e) {
		//判断点击的是不是左键
		if(e.Button == MouseButtons.Left) {
			//重新绘制窗体X
			this.Left += e.X - startX;
			//重新绘制窗体Y
			this.Top += e.Y - startY;
		}
	}
}