public string changePassword([FromBody] TamuModel tamu)
        {
            try
            {
                connection = new SqlConnection(ConnectionModel.connectionString);
                connection.Open();

                string email          = tamu.email;
                string password       = EncryptionModel.encryption(tamu.password);
                string passwordRepeat = EncryptionModel.encryption(tamu.confirm);

                command = new SqlCommand("SELECT * FROM tamu WHERE email = '" + email + "' AND password LIKE '" + password + "'", connection);
                reader  = command.ExecuteReader();
                reader.Read();
                if (reader.HasRows)
                {
                    reader.Close();

                    command = new SqlCommand("UPDATE tamu SET password = '******' WHERE email = '" + email + "' AND password LIKE '" + password + "'", connection);
                    command.ExecuteReader();
                    connection.Close();

                    return("Success");
                }
                else
                {
                    reader.Close();
                    connection.Close();
                    return("Fail");
                }
            } catch (Exception)
            {
                return("Fail");
            }
        }
        public TamuModel login([FromBody] TamuModel tamu)
        {
            try
            {
                connection = new SqlConnection(ConnectionModel.connectionString);
                connection.Open();

                string email    = tamu.email;
                string password = EncryptionModel.encryption(tamu.password);

                command = new SqlCommand("SELECT * FROM tamu WHERE email = '" + email + "' AND password LIKE '" + password + "'", connection);
                reader  = command.ExecuteReader();
                reader.Read();

                if (reader.HasRows)
                {
                    tamu.id       = Convert.ToInt32(reader[0]);
                    tamu.nik      = Convert.ToString(reader[1]);
                    tamu.nama     = Convert.ToString(reader[2]);
                    tamu.email    = Convert.ToString(reader[3]);
                    tamu.nohp     = Convert.ToString(reader[4]);
                    tamu.alamat   = Convert.ToString(reader[5]);
                    tamu.password = Convert.ToString(reader[6]);

                    connection.Close();

                    return(tamu);
                }
                else
                {
                    connection.Close();
                    return(null);
                }
            } catch (Exception)
            {
                return(null);
            }
        }