On May 3rd, I saw Todd Anglin present "Building a Testable Data Access Layer" at the Dallas C# SIG. His talk focused more on good design for data access and keeping the UI and other non-DAL areas free of data access dependencies. Once this is accomplished then mocking the data access is much easier. Building tests almost becomes an afterthought.
Todd is an engaging speaker with the ability to communicate about important concepts in simple terms. I recommend reading his materials for this presentation. I think it was recorded as well. If they post the recording, I recommend watching it as well.
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