public void Index() { var v = new VeriCode(); string code = v.CreateVerifyCode(); using (var ms = new System.IO.MemoryStream()) { var context = ControllerContext.HttpContext; using (Bitmap image = v.CreateImageCode(code)) { image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); context.Response.ClearContent(); context.Response.ContentType = "image/jpeg"; context.Response.BinaryWrite(ms.GetBuffer()); image.Dispose(); } } Session["VeriCode"] = code; }