In C#, how to check if a TCP port is available?

When hosting wcf service which is use net tcp binding and without port sharing in a windows service , we should make sure the availability of our wcf port number. Other wise service doesn't start.

There fore as a best practice its is better to have code which will check the availability of the port when starting the service.This code should included to the service startup event. 

   1: protected override void OnStart(string[] args)

   2:        {

   3:            try

   4:            {

   5:                if (serviceHost != null)

   6:                {

   7:                    serviceHost.Close();

   8:                }

   9:  

  10:                PortChecker pc = new PortChecker();

  11:  

  12:                if (pc.IsPortAvailable())

  13:                {

  14:                    serviceHost = new ServiceHost(typeof(M3ISPlusService));

  15:                    serviceHost.Open();

  16:                }

  17:            }

ANd this is the port checker class

   1: public bool IsPortAvailable()

   2:         {

   3:             bool isAvailable = false;

   4:             TcpListener tcpListner = new TcpListener(GetServerIp(), GetPort());

   5:             Logger logger = Logger.GetLogger();

   6:  

   7:             try

   8:             {

   9:                 tcpListner.Start();

  10:                 isAvailable = true;

  11:             }

  12:             catch (Exception ex)

  13:             {

  14:                 logger.Log(ex.Message);

  15:             }

  16:  

  17:             finally

  18:             {

  19:                 try

  20:                 {

  21:                     tcpListner.Stop();

  22:                     tcpListner = null;

  23:                 }

  24:                 catch (Exception)

  25:                 {

  26:                     tcpListner = null;

  27:                 }

  28:             }

  29:  

  30:             return isAvailable;

  31:         }

To get port in code please refer my previous post :- Read End point address programmatically

Happy Coding :)