WCF contract changes that affect clients

Question

I was curious if someone could outline which types of WCF contract (interface) changes on the server side would break a client trying to send in a message, and why. I believe W

Answer 1

I think the best practice is to think of contracts as unbreakable, hmmm, contracts. Don't change them once they're published. It's easy enough to create a new contract with the changes you want, and to expose the new contract on a new endpoint.