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Open Serial port and read

using System; using System.Collections.Generic; using System.Text; using System.IO.Ports; class Serial {  public static void Main()  {       byte[] buffer = new byte[256];       using (SerialPort sp = new SerialPort("COM1", 19200))       {            sp.Open();            //read directly            sp.Read(buffer, 0, (int)buffer.Length);            //read using a Stream            sp.BaseStream.Read(buffer, 0, (int)buffer.Length);       }  } } Unhandled Exception: System.IO.IOException: The port 'COM1' does not exist. at System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str) at System.IO.Ports.SerialStream..ctor(String portName, Int32 baudRate, Parity parity, Int32 dataB its, StopBits stopBits, Int32 readTimeout, Int32 writeTimeout, Handshake handshake, Boolean dtrEnabl e, Boolean rtsEnable, Boolean discardNull, Byte parityReplace) at System.IO.Ports.SerialPort.Open() at Serial.Main()