摘要： 1protected void Page_Load(object sender, EventArgs e)2 {3 Bitmap bitmap = CreateBitmap(GetRandomDigit(2)+GetRandomNumbers(2));4 bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);5 bitmap.Dispose();6 }7 #region 数字验证8 public string GetRandomDigit(int len)9 {10 string str = "1234567890";11 阅读全文