Answer / Avneet Kumar Gill

In WCF, there are four main message exchange patterns: 1. Request-Response: The client sends a request and waits for a response from the service. 2. One-Way: The client sends a request but does not expect a response from the service. 3. Duplex (Request-Reply and Solicit-Response): This pattern allows for bidirectional communication between client and service. 4. Sessionful (Per Session and Per Call): These are variations of duplex messaging where sessions can be created to maintain context across multiple messages.

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