private void SetCaptcha() { // Set image string s = new Captcha().GenerateSolution(null); // Save to session Session["captcha"] = s.ToLower(); /* if (context.Session["Captcha"].ToString() != null) { strCaptcha = context.Session["Captcha"].ToString(); }*/ imgCaptcha.ImageUrl = "~/Handlers/CaptchaHandler.ashx?c=" + s; }