/// <summary>
        /// Executes a subroutine, synchronously only.
        /// </summary>
        /// <param name="subroutineName">Name of BASIC subroutine to execute.</param>
        /// <param name="argsNumber">Number of arguments</param>
        /// <param name="arguments">The subroutine arguments list. Each argument is a substring separated with the ASCII char DC4 (20).</param>
        /// <param name="inputFormat">Indicates in what format you wish to send the subroutine arguments: MV, XML or JSON.</param>        /// <param name="outputFormat">Indicates in what format you want to receive the data resulting from the operation: MV, XML or JSON.</param>
        /// <param name="customVars">Free text sent to the database allows management of additional behaviours in SUB.LK.MAIN.CONTROL.CUSTOM, which is called when this parameter is set.</param>
        /// <param name="receiveTimeout">Maximum time in seconds that the client will wait for a response from the server. Default = 0 to wait indefinitely.</param>
        /// <returns>The results of the operation.</returns>
        public string Subroutine(string subroutineName, int argsNumber, string arguments, DATAFORMAT_TYPE inputFormat = DATAFORMAT_TYPE.MV, DATAFORMAT_TYPE outputFormat = DATAFORMAT_TYPE.MV, string customVars = "", int receiveTimeout = 0)
        {
            string subroutineArgs   = OperationArguments.GetSubroutineArgs(subroutineName, argsNumber, arguments, customVars);
            byte   opCode           = (byte)OPERATION_CODE.SUBROUTINE;
            byte   byteInputFormat  = (byte)inputFormat;
            byte   byteOutputFormat = (byte)outputFormat;
            string connectionInfo   = this._ConnectionInfo.ToString();
            string result           = Linkar.ExecutePersistentOperation(this._ConnectionInfo, opCode, subroutineArgs, byteInputFormat, byteOutputFormat, receiveTimeout);

            return(result);
        }
        /// <summary>
        /// Executes a subroutine, synchronously only.
        /// </summary>
        /// <param name="credentialOptions">Object with data necessary to access the Linkar Server: Username, Password, EntryPoint, Language, FreeText.</param>
        /// <param name="subroutineName">Name of BASIC subroutine to execute.</param>
        /// <param name="argsNumber">Number of arguments.</param>
        /// <param name="arguments">The subroutine arguments list. Each argument is a substring separated with the ASCII char DC4 (20).</param>
        /// <param name="inputFormat">Indicates in what format you wish to send the subroutine arguments: MV, XML or JSON.</param>
        /// <param name="outputFormat">Indicates in what format you want to receive the data resulting from the operation: MV, XML or JSON.</param>
        /// <param name="customVars">Free text sent to the database allows management of additional behaviours in SUB.LK.MAIN.CONTROL.CUSTOM, which is called when this parameter is set.</param>
        /// <param name="receiveTimeout">Maximum time in seconds that the client will wait for a response from the server. Default = 0 to wait indefinitely.</param>
        /// <returns>The results of the operation.</returns>
        public static string Subroutine(CredentialOptions credentialOptions, string subroutineName, int argsNumber, string arguments,
                                        DATAFORMAT_TYPE inputFormat = DATAFORMAT_TYPE.MV, DATAFORMAT_TYPE outputFormat = DATAFORMAT_TYPE.MV,
                                        string customVars           = "", int receiveTimeout = 0)
        {
            string subroutineArgs   = OperationArguments.GetSubroutineArgs(subroutineName, argsNumber, arguments, customVars);
            byte   opCode           = (byte)OPERATION_CODE.SUBROUTINE;
            byte   byteInputFormat  = (byte)inputFormat;
            byte   byteOutputFormat = (byte)outputFormat;
            string result           = Linkar.ExecuteDirectOperation(credentialOptions, opCode, subroutineArgs, byteInputFormat, byteOutputFormat, receiveTimeout);

            return(result);
        }