很好的验证码生成程序。使用方法：

picid = Request.QueryString[\"time\"].ToString().Trim()

picid =Math.Round((Convert.ToDouble(picid)*10000),0).ToString()

Tools.image.VerifyImage pic = new Tools.image.VerifyImage(picid, 90, 50)

System.IO.MemoryStream ms = new System.IO.MemoryStream()

pic.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Png)

Response.ClearContent()

Response.ContentType = \"image/png\"

Response.BinaryWrite(ms.ToArray())

Response.Cookies[\"Vcode\"].Value = picid