ReSharper (#js #vs)

If you’re a web developer, jaw-dropping support for JavaScript, CSS, and
view engine should be a perfect reason for you to get the latest

ReSharper:: The Most Intelligent Extension for Visual Studio – C# 4.0, VB10, LINQ, VB.NET, ASP.NET, ASP.NET MVC, XML, XAML, build scripts. Best-of-breed tools for code quality analysis, code cleanup, navigation, code generation, and unit testing, plus multiple refactorings and code templates.