C#顺时针逆时针旋转图片

this.pictureBox1.Image.RotateFlip(RotateFlipType.Rotate90FlipNone);

this.pictureBox1.Refresh();
逆时针旋转图片

this.pictureBox1.Image.RotateFlip(RotateFlipType.Rotate270FlipNone);
this.pictureBox1.Refresh();