.NET (Core and Framework)

<br />
class SocketConnector<br />
{<br />
 AsyncCallback m_callback = null;<br />
 System.Net.Sockets.Socket m_socket = null;<br />
 bool m_connected = false;<br />
 public bool Connected<br />
 {<br />
  get { return m_connected; }<br />
 }<br />
 public void Connect(string ipaddress, int port)<br />
 {<br />
  // set up callback<br />
  m_callback = new AsyncCallback( OnConnect );<br />
<br />
  // create socket<br />
  m_socket = new Socket (AddressFamily.InterNetwork,SocketType.Stream <br />
,ProtocolType.Tcp );<br />
  m_socket.Blocking = false;<br />
<br />
  // get the remote IP address<br />
  IPAddress ip = IPAddress.Parse (ipaddress);<br />
  int iPortNo = System.Convert.ToInt16 ( port);<br />
<br />
  //create the end point<br />
  IPEndPoint ipEnd = new IPEndPoint (ip,iPortNo);<br />
<br />
  // begin async connect<br />
  IAsyncResult ar = m_socket.BeginConnect( ipEnd, m_callback, m_socket );<br />
<br />
  // wait for connect<br />
  ar.AsyncWaitHandle.WaitOne(2000,false);<br />
<br />
  if (!ar.IsCompleted || m_callback!=null)<br />
  {<br />
   // BeginConnect did not finish, breakpoint here to test<br />
   m_connected = false;<br />
   // ..<br />
   return;<br />
  }<br />
  // beginconnect finished OK<br />
  m_connected = true;<br />
 }<br />
 void OnConnect(IAsyncResult result)<br />
 {<br />
  m_callback = null;<br />
 }<br />
} <br />
<br />