>Ah. I compiled that (after digging up a matching implementation of CustomTextMessageEncoder here http://msdn.microsoft.com/en-us/library/ms751486(v=vs.110).aspx)
>
>Seems that C# inherits the constraint from the base class - if I add it to the BuildChannelListener method I get an error :
>"Constraints for explicit interface implementation method are inherited from the base method, so they cannot be specified directly"
>
>I guess VB.NET doesn't work that way - i.e. they *have* to be specified :-{

Yup, exactly what I thought. Thanks for confirming it.