I've never done interviews but based on my point of view as a developer, I think that's the best way to assess a candidate. You should ask questions about his experience. Anything he puts on his resume is fair game. A programmer's task is programming, not knowing about everything about every programming languages or concepts in the universe. You should ask him how he program, how he goes from getting a task and implementing a practical solution by following enterprise pattern. But you need a good technical interviewer to help with this.
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I've never done interviews but based on my point of view as a developer, I think that's the best way to assess a candidate. You should ask questions about his experience. Anything he puts on his resume is fair game. A programmer's task is programming, not knowing about everything about every programming languages or concepts in the universe. You should ask him how he program, how he goes from getting a task and implementing a practical solution by following enterprise pattern. But you need a good technical interviewer to help with this.