ping.cs

internal bool DoPing(string hostname)
{
   try
   {
       using (var client = new TcpClient())
       {
           var result = client.BeginConnect(hostname, 445, null, null);
           var success = result.AsyncWaitHandle.WaitOne(_pingTimeout);
           if (!success)
           {
               return false;
           }

           client.EndConnect(result);
       }
   }
   catch
   {
       return false;
   }
   return true;
}