public void captcha_generation() { member_home.imgver.ServiceClient fromService = new member_home.imgver.ServiceClient(); string length = 5.ToString(); verfy_string = fromService.GetVerifierString(length); Session["verifyStr"] = verfy_string; Image1.Visible = true; Stream myStream = fromService.GetImage(verfy_string); MemoryStream memStr = new MemoryStream(); myStream.CopyTo(memStr); BinaryReader br = new BinaryReader(myStream); byte[] bytes = memStr.ToArray(); string bs = Convert.ToBase64String(bytes, 0, bytes.Length); Image1.ImageUrl = "data:image/png;base64," + bs; }