如何检测c＃中是否有来自GSM调制解调器的传入短信

Question

我想创建一个自动检测传入短信的C＃应用​​程序。它将处理该SMS中的消息并将某些内容重新发送到SMS来自的相同号码。我可以成功发送和接收短信，但不能让程序自动检测短信并处理它。我开发的代码仅适用于少量短信，然后停止工作。这段代码有什么问题，还有另外一种更好的方法吗？

在此代码中我{cal runTimer() ..

public void RunEvent(object source, ElapsedEventArgs e)
{
    try
    {
        int uCountSMS = objclsSMS.CountSMSmessages(port);
        if (uCountSMS > 0)
        {
            objShortMessageCollection = objclsSMS.ReadSMS(this.port, strCommand);
            foreach (ShortMessage msg in objShortMessageCollection)
            {
                if (msg.Sender == "+923007302422")
                {
                    //    this.textBox1.Text = "no";
                    if (msg.Message == "code")
                    {

                        objclsSMS.sendMsg(this.port, "any number", "good");

                    }
                    else if (msg.Message == "hi")
                    {
                        objclsSMS.sendMsg(this.port, "anynumber", "bye");

                    }

                    //     objclsSMS.DeleteMsg(this.port, "AT+CMGD=1,3");
                }
            }
        }
    }
    catch (Exception ex)
    {
        ErrorLog(ex.ToString());
    }
}  

public void runTimer()
{
    try
    {
        System.Timers.Timer aTimer = new System.Timers.Timer(3000);

        aTimer.Elapsed += new ElapsedEventHandler(RunEvent);
        //    aTimer.Interval = 3000;
        aTimer.Enabled = true;
    }
    catch (Exception ex)
    {
        ErrorLog(ex.ToString());
    }
}