public ActionResult SignIn(SignInVM User)
        {
            //add fullname and userid to vm

            if (ModelState.IsValid)
            {
                Users u = new Users();

                if (u.Authenticate(User.Login, User.Passkey))
                {
                    DateTime exDate = User.RememberMe ? DateTime.Now.AddMonths(6) : DateTime.Now.AddDays(1);
                    FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, u.UserID,
                                                                                     DateTime.Now,
                                                                                     exDate,
                                                                                     true,
                                                                                     u.Fullname, FormsAuthentication.FormsCookiePath);
                    AppUtility.SetCookie(FormsAuthentication.FormsCookieName, FormsAuthentication.Encrypt(ticket), exDate, FormsAuthentication.RequireSSL);

                    AppUtility.SetCookie("UserFName", u.FirstName);
                    AppUtility.SetCookie("DeviceType", AppUtility.GetDeviceType());

                    if (string.IsNullOrEmpty(User.ReturnUrl))
                    {
                        return(Redirect(FormsAuthentication.DefaultUrl));
                    }
                    else
                    {
                        return(Redirect("~" + HttpUtility.UrlDecode(User.ReturnUrl)));
                    }
                }
                else
                {
                    ModelState.AddModelError("", Users.ReturnMessage);
                    TempData["SignInMsg"] = Users.ReturnMessage;
                    return(RedirectToAction("Index", "Home"));
                }
            }

            ModelState.AddModelError("", "Provide login and password");
            TempData["SignInMsg"] = "Provide login and password";
            return(RedirectToAction("Index", "Home"));
        }