Agile Principles, Patterns and Practice in C#, by Robert C. Martin and Micah Martin, covers a number of agile practices in C#.
The book is a little old by now (2006), but while it does feel dated at points, that doesn't take away the overall quality.
I particularly liked how much time was spent going through the analysis and coding of a large practical example (a payroll) – including DB persistence.
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