title: Reading from and Sending data to Serial port
body: <p>I'm trying to do a serial port communication to send and receive data. Here is the scenerio:</p>
  
  <p>I connect to a serial port and start my device. When it's counting down to do something, I should pause it and send it some command to work. It does all work and then again the starting continues.</p>
  
  <p>Now i searched through the internet and c# fits me. Can you suggest anything to me while doing this? How can i start and which methods do i need to use ? Thank you.</p>