update query in linq to sql

update query in linq to sql

         /// <summary>
        /// Update to user profile for current user.
        /// </summary>
        /// <returns></returns>
        public bool UpdateUserProfile(string FirstName, string LastName, string Email, string Country, string ZipCode, string TimeZone)
        {
            using (var dbContext = new BMServices_AzureEntities(DataAccess.ConnectionStringManager.ConnectionString))
            {
                core_Users newUser = new core_Users();
                newUser = dbContext.core_Users.Where(usr => usr.userEmail == Email).SingleOrDefault();
                if (newUser!=null)
                newUser.firstName = FirstName;
                newUser.lastName = LastName;              
                newUser.countryId = Convert.ToInt32(Country);
                newUser.zipCode = ZipCode;
                newUser.timeZoneId = Convert.ToInt32(TimeZone);           
                dbContext.SaveChanges();              
                return true;
            }
        }