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    <p>You are missing serialPort1.DataReceived += serialPort1_DataReceived_1 in your code. And opening the COM port on a separate thread is quite ok. As for baud rate, stop bits etc, I would go with a safe default. 9600 baud, no parity, one stop bit, 8 data bits. That should work for most modems. You might also want to send "ATZ" first to reset the modem before sending other commands.</p> <p>As for knowing which COM port to use, see my answer on your other SO question. Either iterate the COM ports and try them all, or query with WMI.</p> <p>I've modified the code and moved the serial port code into the thread delegate. And also hooked on the data received event.</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Threading; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } public class ThreadWork { public static void DoWork() { serialPort1.Open(); serialPort1.Write("AT+CMGF=1\r\n"); //Thread.Sleep(500); serialPort1.Write("AT+CNMI=2,2\r\n"); //Thread.Sleep(500); serialPort1.Write("AT+CSCA=\"+4790002100\"\r\n"); //Thread.Sleep(500); serialPort1.DataReceived += serialPort1_DataReceived_1; } } private void Form1_Load(object sender, EventArgs e) { ThreadStart myThreadDelegate = new ThreadStart(ThreadWork.DoWork); Thread myThread = new Thread(myThreadDelegate); myThread.Start(); } private void serialPort1_DataReceived_1(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { string response = serialPort1.ReadLine(); this.BeginInvoke(new MethodInvoker(() =&gt; textBox1.AppendText(response + "\r\n"))); } } } </code></pre> <p>Also check out the MSDN docs on using the <a href="http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.datareceived.aspx?queryresult=true" rel="nofollow noreferrer">SerialPort DataReceived</a> event.</p>
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    1. USMikael Svenson
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    1. COthank you very much, im getting this error: Error 1 An object reference is required for the non-static field, method, or property 'WindowsFormsApplication1.Form1.serialPort1' C:\Users\alexluvsdanielle\AppData\Local\Temporary Projects\WindowsFormsApplication1\Form1.cs 23 17 WindowsFormsApplication1
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    2. COYou need to declare serialPort1 somewhere in your code. Typically this is in your Form1.Designer.cs in InitializeComponent() - this.serialPort1 = new System.IO.Ports.SerialPort(this.components);
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