Code Contracts - TDD in a DbC World

As developers start to discover the upcoming Code Contracts for .NET 4.0, it's important to understand not only Design by Contract, and TDD, but how they can complement each other. For business value, we as developers need to flush out our design through the use of TDD, and we can refactor into using contracts for our constraints over time. With these methodologies in place, the edge cases will melt away and help us ensure DRY and write more concise code directly having business value.