Explain Bundle.Config in MVC4? Technology Community › Category: ASP.NET MVC › Explain Bundle.Config in MVC4? 0 Vote Up Vote Down VietMX Staff asked 4 years ago “BundleConfig.cs” in MVC4 is used to register the bundles by the bundling and minification system. Many bundles are added by default including jQuery libraries like — jquery.validate, Modernizr, and default CSS references.