程序代码：

private bool isMove = false;
private int MouseDownX;
private int MouseDownY;


 private void lblCode_MouseMove(object sender, MouseEventArgs e)
  {
  if (isMove)//如果左键按下的话
  {
  ((Button)sender).Location = new Point(((Button)sender).Left + e.X - MouseDownX, ((Button)sender).Top + e.Y - MouseDownY);
  }


 private void lblCode_MouseDown(object sender, MouseEventArgs e)
  {
  isMove = true;
    
  MouseDownX = e.X;
  MouseDownY = e.Y;
    

 
  }
  private void lblCode_MouseUp(object sender, MouseEventArgs e)
  {
  isMove = false;
  }