Web services and interface compatibility

public class WcfClient<T> : ClientBase<T> where T : class
{
    public new T Channel {get {return base.Channel;}}
}

using(var client = new WcfClient<IFoo>())
{
    client.Channel.Bar(); // defined by IFoo
}

public class WcfClient<T> : ClientBase<T>, IDisposable where T : class
{
    public new T Channel {get {return base.Channel;}}
    void IDisposable.Dispose() {
        try {
           switch(State) {
              case CommunicationState.Open: Close(); break;
              // etc
           }
        } catch {} // swallow it down (perhaps log it first)
    }
}