The ultimate Agile tool is ReSharper. It is the one thing for .NET developers that removes fear of change. Refactoring is just so darn easy that change isn't scary.
Navigation features to instantly traverse your entire solution. You can jump to any file, type, or member in your code base in no time, or navigate from a specific symbol to its usages, base and derived symbols, or implementations.
Multiple code editing helpers including extended IntelliSense, hundreds of instant code transformations, auto-importing namespaces, rearranging code and displaying documentation.
You don't have to write properties, overloads, implementations, and comparers by hand: use code generation actions to handle boilerplate code faster.
Instant fixes to eliminate errors and code smells. Not only does ReSharper warn you when there's a problem in your code but it provides quick-fixes to solve them automatically.
Enjoy solution-wide refactorings to safely change your code base. Whether you need to revitalize legacy code or put your project structure in order, you can lean on ReSharper.
Code formatting and cleanup to get rid of unused code and ensure compliance to coding standards.
ReSharper also provides extensible project maintenance features such as high-level refactorings and a project dependency viewer, templates, internationalization assistance, a powerful unit test runner, and language-specific features: for example, those for ASP.NET/ASP.NET MVC and XAML.