private void PrincipalAuthUpdate(UserDto user)
        {
            CustomPrincipalSerializeModel serializeModel = new CustomPrincipalSerializeModel();
            serializeModel.Id = user.Id;
            serializeModel.ImageUrl = user.ImageUrl;
            serializeModel.IsAdministrator = user.IsAdministrator;
            serializeModel.FirstName = user.FirstName;
            serializeModel.LastName = user.LastName;

            JavaScriptSerializer serializer = new JavaScriptSerializer();

            string userData = JsonConvert.SerializeObject(serializeModel);

            FormsAuthenticationTicket authTicket = new FormsAuthenticationTicket(
                     1,
                     user.Email,
                     DateTime.Now,
                     DateTime.Now.AddMinutes(1),
                     false,
                     userData);

            string encTicket = FormsAuthentication.Encrypt(authTicket);
            HttpCookie faCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encTicket);
            Response.Cookies.Add(faCookie);
        }