What should you do?
A. On the OperationContractAttribute, set the AsyncPattern property value to true.
B. On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.
C. On the client, create a proxy derived from DuplexClientBase<TChannel>.
D. On the client, use GetCallbackChannel<T>.
Answer:C
What should you do?
A. On the OperationContractAttribute, set the AsyncPattern property value to true. B. On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client. C. On the client, create a proxy derived from DuplexClientBase<TChannel>. D. On the client, use GetCallbackChannel<T>.