程序代码：

private void button2_Click(object sender, EventArgs e)
        {
            if (button2.Tag == "true")
            {
                this.BackColor = Color.Red;
                button2.Tag = "false";
            }
            else
            {
                this.BackColor = Color.Blue;
                button2.Tag = "true";
            }
            this.pictureBox1.Image.RotateFlip(RotateFlipType.Rotate90FlipNone);
        }