[100分送上] 通常每个套接字地址 协议 网络地址 端口 只允许使用一次。该如何处理

 
 static void Main(string[] args) 
 		{ 
 			AppMain app = new AppMain(); 
 //			connStr = app.GetConnStr(); 
 			// Welcome and Start listening 
 			app.log.WriteLog("*** ESP Server Started " + DateTime.Now.ToString( "G" ) + "***" , EventLogType.Information); 
 			int nPortListen = app.GetPort();//7893; 
             app.GetBufferSize(); 
 			Socket listener = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp ); 
 			listener.Bind( new IPEndPoint( IPAddress.Any ,nPortListen ) ); 
 			listener.Listen( 500 ); 
 			app.log.WriteLog("Listening on : " + nPortListen , EventLogType.Information); 
 //			app.StartMt(); 
 			 
 			listener.BeginAccept( new AsyncCallback( app.OnConnectRequest ), listener ); 
 			Console.WriteLine ("Press Enter to exit" ); 
 			Console.ReadLine(); 
 			app.log.WriteLog("Server is Closed",EventLogType.Information); 
 			app.mas.Close();//关闭mas 
 			// Clean up before we go home 
 			try 
 			{ 
 				app.workflag = false; 
 				listener.Close(); 
 				 
 				app.rotation1.Abort(); 
 				int tol = app.m_aryClients.Count; 
 				int i = 0; 
 				while(i  < tol )	 
 				{ 
 					SocketChatClient client = (SocketChatClient)app.m_aryClients[i]; 
 					client.Sock.Shutdown(SocketShutdown.Send); 
 					client.SendIsVal = false;					 
 					i++; 
 					app.m_aryClients.Remove(client); 
 				} 
 		   } 
 			catch(Exception e) 
 			{ 
 				app.log.WriteLog(e,"关闭异常"); 
  
 			} 
 //			Console.ReadLine(); 
 		}