int ScreenWidth = SystemInformation.PrimaryMonitorMaximizedWindowSize.Width;         int ScreenHeight = SystemInformation.PrimaryMonitorMaximizedWindowSize.Height;         private int speedX = 4;         private int speedY = 3;         private bool canMove = true;         int myswitch = 1;//为了我可以控制停止所以添加的飘与停的切换开关         private void timer1_Tick(object sender, EventArgs e)         {             if (canMove)             {                 this.DesktopLocation = new Point(this.DesktopLocation.X + speedX, this.DesktopLocation.Y + speedY);                 if (this.DesktopLocation.X + this.Width >= ScreenWidth || this.DesktopLocation.X < 0)                 {                     speedX = -speedX;                 }                 if (this.DesktopLocation.Y + this.Height >= ScreenHeight || this.DesktopLocation.Y < 0)                 {                     speedY = -speedY;                 }             }         }         private void button1_Click(object sender, EventArgs e)         {             myswitch *= -1;             if (myswitch == -1)             {                 canMove = false;                 //button1.Text = "飘动";             }             else             {                 canMove = true;                 //button1.Text = "停止";             }         }         private void Form1_Load(object sender, EventArgs e)         {         }         private void Form1_DoubleClick(object sender, EventArgs e)         {             Application.Exit();         }