public ActionResult Index(string path, int width, int height)
{
var code = ValidateCodeHelper.GetValidateCode(4);
Session["vcode_" + path] = code.ToLower();
var image = ValidateCodeHelper.CreateValidateImage(code);
var stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
image.Dispose();
stream.Position = 0;
return(File(stream, "image/jpeg", "verifyCode.jpg"));
}