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I don’t think it’s really necessary to present ReSharper (often abbreviated R#), but in case you don’t know about it, it’s a tool made by JetBrains that performs real-time analysis of your C# or VB.NET code to warn you about possible bugs, bad practices, convention violations, etc. It also provides many useful refactorings and code generators. I’ve been using it for a few years now, and it has tremendously improved both my productivity and my coding style.