Difference between OperationTimeout and SendTimeout in WCF

Question

After quite a bit of searching, I could not find the answer to this question.

What is exact difference between OperationTimeout and SendTimeout? I read Operat

Answer 1

I'd like to propose reading this answer from Brian McNamara over on the MSFT forums:

Brief summary of binding timeout knobs...

Client side:

• SendTimeout is used to initialize the OperationTimeout, which governs the whole interaction for sending a message (including receiving a reply message in a request-reply case). This timeout also applies when sending reply messages from a CallbackContract method.
• OpenTimeout and CloseTimeout are used when opening and closing channels (when no explicit timeout value is passed).
• ReceiveTimeout is not used.

Server side:

• Send, Open, and Close Timeout same as on client (for Callbacks).
• ReceiveTimeout is used by ServiceFramework layer to initialize the session-idle timeout.