加个PictureBox 鼠标动的时候改变PictureBox 位置
 
private bool isButtonDown = false;
 private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            this.isButtonDown = true;
        }        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            this.isButtonDown = false;
            this.pictureBox1.Hide();
        }        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isButtonDown)
            {
                this.pictureBox1.Show();
                this.pictureBox1.Top = e.Y;
                this.pictureBox1.Left = e.X;
            }
        }