在C＃中从gsm调制解调器发出呼叫和接收数据

Question

我想使用gsm调制解调器调用类似*21*2# AT Command的服务号码，但我想在RichtextBox中收到答案（因为它是服务号码），hox要做到这一点 ？ ：（

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private void button1_Click(object sender, EventArgs e)  
{  
    SerialPort po = new SerialPort();  
    po.PortName = "COM3";  
    po.BaudRate = int.Parse( "9600");  
    po.DataBits = Convert.ToInt32("8");  
    po.Parity = Parity.None;  
    po.StopBits = StopBits.One;  
    po.ReadTimeout = int.Parse("300");  
    po.WriteTimeout = int.Parse("300");  
    po.Encoding = Encoding.GetEncoding("iso-8859-1");  
    po.Open();  
    po.DtrEnable = true;  
    po.RtsEnable = true;  
    po.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);  
    po.Write("ATD9030665834;");  
}  
public void port_DataReceived(object sender, SerialDataReceivedEventArgs e)  
{  
    if (e.EventType == SerialData.Chars)  
    {  
              
    }  
}  

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