我想在登录窗体中设置图片验证，就像QQ当中需要输入验证符一样的图片，这个是怎么做的啊？教一下我吧，谢谢了

要有一个PICBOX   在里面显示验证数字或者字母   代码段百度下

基本上这个先生成随机数，然后建BITMAP对像，在基中用某些字体写上随机数，最后用picturebox控件显示。

Random random = new Random();
            Bitmap image = new Bitmap(190, 47);//(190,47)为pictureBox1的大小
            Graphics g = Graphics.FromImage(image);
            //清空图片背景色
            g.Clear(Color.White);
            //画图片的背景噪音线
            for (int i = 0; i < 5; i++)
            {
                Point p1 = new Point();
                p1.X = random.Next(image.Width);
                p1.Y = random.Next(image.Height);
                Point p2 = new Point();
                p2.X = random.Next(image.Width);
                p2.Y = random.Next(image.Height);
                g.DrawLine(new Pen(Color.Blue), p1, p2);
            }
            Font font = new Font("Arial", 33, System.Drawing.FontStyle.Bold);
            g.DrawString(CheckCode(), font, new SolidBrush(Color.Red), 1, 5);

            //画图片的前景噪音点
            for (int i = 0; i < 2000; i++)
            {
                int x = random.Next(image.Width);
                int y = random.Next(image.Height);
                image.SetPixel(x, y, Color.FromArgb(random.Next()));
            }
            //画图片的边框线
            g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
            this.pictureBox1.BackgroundImage = image;   

受教了。