public static string SaveUser(string userName, string passWord)
        {
            var userSecurityAndEncryptionDbEntities = new UserSecurityAndEncryptionDBEntities();
            var user = new T_User()
            {
                UserName = userName, Password = Sha1Encryptor.GetSHA1HashData(passWord)
            };

            userSecurityAndEncryptionDbEntities.T_User.Add(user);
            userSecurityAndEncryptionDbEntities.SaveChanges();
            return(String.Empty);
        }
        public static void UpdateUser(string existingUserName, string userName, string passWord)
        {
            var    userSecurityAndEncryptionDbEntities = new UserSecurityAndEncryptionDBEntities();
            T_User userToUpdate = userSecurityAndEncryptionDbEntities.T_User.FirstOrDefault(user => user.UserName == existingUserName);

            if (userToUpdate == null)
            {
                return;
            }
            userToUpdate.UserName = userName;
            userToUpdate.Password = Sha1Encryptor.GetSHA1HashData(passWord);
            userSecurityAndEncryptionDbEntities.SaveChanges();
        }