1  static ITest channel;
 2         static object channelLock = new object();
 3 
 4         public static ITest GetChannel()
 5         {
 6             if (channel != null && ((ICommunicationObject)channel).State == CommunicationState.Opened)
 7             {
 8                 try
 9                 {
10                     // ((ICommunicationObject)channel).Open();
11                     return channel;
12                 }
13                 catch (CommunicationException ex)
14                 {
15                     ((ICommunicationObject)channel).Abort();
16                     channel = null;
17                 }
18                 return GetChannel();
19             }
20             else
21             {
22                 NetTcpBinding binding = new NetTcpBinding(SecurityMode.None);
23                 EndpointAddress address = new EndpointAddress("net.tcp://localhost:1234/TestService");
24                 ITest localTest = DuplexChannelFactory<ITest>.CreateChannel(binding, address);                 
25                 ((ICommunicationObject)localTest).Open();
26                 channel = localTest;
27                 return channel;
28             }
29         }