程序已经弄好，差个保存不会弄，希望有人可以帮我弄，我是在picturebox 上绘画的，想要保存成图片，实现不了，懂的朋友帮帮忙。保存事件在from2 的 save 事件里面

    private void tsbtnSave_Click(object sender, EventArgs e)
        {
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "BMP File (*.bmp)|*.bmp|JPEG File (*.jpg)|*.jpg|GIF File (*.gif)|*.gif|PNG File (*.png)|*.png";
            sfd.FilterIndex = 2;
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                ImageFormat format = ImageFormat.Jpeg;
                switch (sfd.FilterIndex)
                {
                    case 1: format = ImageFormat.Bmp; break;
                    case 2: format = ImageFormat.Jpeg; break;
                    case 3: format = ImageFormat.Gif; break;
                    case 4: format = ImageFormat.Png; break;
                    default: format = ImageFormat.Bmp; break;
                }
                picScreen.Image.Save(sfd.FileName, format);//保存图片
            }
        }