private void CheckIdentifyingCode() {

Random r = new Random();

string str = "";

for (int i = 0; i < 5; i++)

{

int a = r.Next(0, 10);

str += a;//将数字连接到一块

}

Bitmap bm = new Bitmap(150, 90);//创建位图对象

Graphics g = Graphics.FromImage(bm);//在bm中重新画图

//创建字体跟颜色数组

string[] font = { "楷体", "黑体", "宋体", "斜体", "新宋体" };

Color[] colors = { Color.Red, Color.Blue, Color.Green, Color.Yellow, Color.YellowGreen };

//开始画图

for (int i = 0; i < 5; i++)

{

Point p = new Point(i * 20, 0);

g.DrawString(str[i].ToString(), new Font(font[i], 20, FontStyle.Bold), new SolidBrush(colors[i]), p);

}

pictureBox1.Image = bm;//将位图显示到picture上

}