title: how can I send dial-up message through external modem connected serial port?
body: <p>I connect the external modem to the pc with serial port.
  so i want to connect server through dial-up method with C#.
  And then, send and receive message.</p>
  
  <p>How can i solve this problem? please.</p>
  
  <p>Can I use serialport component of .NET?</p>