Closing WCF connection

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You have all the necessary information at hand – the resulting Best Practice to use and properly close/abort all your WCF client proxies would be:

YourClientProxy clientProxy = new YourClientProxy();

try
{
   .. use your service
   clientProxy.Close();
}
catch(FaultException)
{
   clientProxy.Abort();
}
catch(CommunicationException)
{
   clientProxy.Abort();
}
catch (TimeoutException)
{ 
   clientProxy.Abort();
}

Catching the FaultException handles all cases when the service responsded with an error condition (and thus your channel is in a faulted state), and CommunicationException will handle all other communication-related exceptions that can occur, like network connectivity dropping etc.

The approach with the using() block won’t work, since if an exception happens at the end of the block, when the Dispose() method calls the Close() method on the client proxy, you have no way to catching and handling that.

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