/// <summary>
        /// Set short messages. 
        /// You should input the five parameters:Short Message ID,the tag of the message,the Valid Minutes,the Start Time and the Short Messages Content.
        /// If you want to set personal message, you should use function SetUserSMS to establish the correlation between users and short messages.
        /// </summary>
        /// <param name="SMSID">Short message number</param>
        /// <param name="Tag">Short message type. 253: public short message, 254: personal short message, 255: reserved short message </param>
        /// <param name="ValidMins">Valid duration of a short message. The value ranges from 0 to 65535. That is, the short message becomes valid at StartTime and keeps valid for ValidMinutes. </param>
        /// <param name="StartTime">Start time when a short message becomes valid, in a string format of yyyy-mm-dd hh:mm:ss </param>
        /// <param name="Content">Content of a short message </param>
        /// <param name="IP"> Ip of device </param>
        /// <param name="Port"> Port of Device </param>
        /// <param name="MachineNumber"> Device Number </param>
        private void SetSMS(int SMSID, int Tag, int ValidMins, string StartTime,
        string Content, string IP = "10.0.0.44", int Port = 4370, int MachineNumber = 1)
        {
        //Create Standalone SDK class dynamicly.
            zkemkeeper.CZKEMClass axCZKEM1 = new zkemkeeper.CZKEMClass();
            axCZKEM1.Connect_Net(IP, Port);
        int idwErrorCode = 0;
        if (axCZKEM1.GetSMS(MachineNumber, SMSID, ref Tag, ref ValidMins, ref StartTime, ref Content) == true)
            {
                MessageBox.Show("The ID has existed!Pls change it!", "Error");
        return;
            }
        if (axCZKEM1.SetSMS(MachineNumber, SMSID, Tag, ValidMins, StartTime, Content))
            {
                axCZKEM1.RefreshData(MachineNumber); //After you have set the short message,you should refresh the data of the device
                MessageBox.Show("Successfully set SMS! SMSType=" + Tag.ToString(), "Success");
            }
        else
            {
                axCZKEM1.GetLastError(ref idwErrorCode);
                MessageBox.Show("Operation failed,ErrorCode=" + idwErrorCode.ToString(), "Error");
            }
        }