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private void button2_MouseEnter(object sender, EventArgs e)
        {
            //给按钮一个新的坐标  这个按钮活动的最大宽度 就是 窗体的宽度减去按钮的宽度
            int x = this.ClientSize.Width - button1.Width;
            int y = this.ClientSize.Height - button1.Width;

            Random r = new Random();
            //要给按钮一个随机的坐标
            button2.Location = new Point(r.Next(0, x+1),r.Next(0,y+1));

        }