public void AnnounceOfflineAsync(EndpointDiscoveryMetadata discoveryMetadata, object userState)
{
if (discoveryMetadata == null)
{
throw FxTrace.Exception.ArgumentNull("discoveryMetadata");
}
using (new AnnouncementOperationContextScope(InnerChannel))
{
InnerClient.ByeOperationAsync(discoveryMetadata, userState);
}
}