web页面验证码代码

private void CreateCheckCodeImage(string[] checkCode)

{

if (checkCode == null || checkCode.Length <= 0)

return;

System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), 30);

System.Drawing.Graphics g = Graphics.FromImage(image);

try

{

Random random = new Random();

//清空图片背景色 

g.Clear(Color.White);

//画图片的背景噪音线