帮忙看看下面这个C#程序 - .NET技术 / C#

private void Form1_Load(object sender, EventArgs e)
  {

  }

  private void btnCatchMe_Click(object sender, EventArgs e)
  {
  MessageBox.Show("抓到我了，真厉害！", "抓到了", MessageBoxButtons.OK, MessageBoxIcon.Information);

  }

  private void MainForm_MouseMove(object sender, MouseEventArgs e)
  {
  const int BORDER =50;
  const int SPACE = 20;
  int x = e.X;
  int y = e.Y;
  int left = btnCatchMe.Left;
  int right = btnCatchMe.Right;
  int top = btnCatchMe.Top;
  int bottom = btnCatchMe.Bottom;
  if (x > left - BORDER && x < right + BORDER && y > top - BORDER && y < bottom + BORDER)
  {
  btnCatchMe.Top += y > top ? -SPACE : SPACE;

  if (btnCatchMe.Top < 0 || btnCatchMe.Bottom > this.Height)
  {
  btnCatchMe.Top = this.Height / 2;
  }
  btnCatchMe.Left += x > left ? -SPACE : SPACE;

  if (btnCatchMe.Left < 0 || btnCatchMe.Right > this.Width)