How to enable bundling and minification of CSS/JS in ASP.NET

This is a pretty neat way to bundle and optimize your CSS and Javascript files within your ASP.NET application.

  1. Install the nuget package Microsoft ASP.NET Web Optimization Framework
  2. Add a new class inside the App_Start folder > BundleConfig.cs
  3. Register/group your CSS and JS files the way you want it
    public class BundleConfig
    {
       public static void RegisterBundles(BundleCollection bundles)
       {
          bundles.Add(new StyleBundle("~/bundles/abovethefoldcss").Include(
             "~/Content/css/somecss.css", 
             "~/Content/css/anothercss.css"));
          bundles.Add(new StyleBundle("~/bundles/belowthefoldcss").Include(
             "~/Content/css/bootstrap.css", 
             "~/Content/css/font-awesome.css"));
          bundles.Add(new ScriptBundle("~/bundles/js").Include(
             "~/Scripts/js/jquery.js", 
             "~/Scripts/js/bootstrap.js"));
       }
    }
  4. Call your RegisterBundles method from the Global.asax.cs
    void Application_Start(object sender, EventArgs e)
    {
       BundleConfig.RegisterBundles(BundleTable.Bundles);
    }
  5. Render your bundles inside your view
    <!DOCTYPE html>
    <html lang="en">
    <head>   
       @Styles.Render("~/bundles/abovethefoldcss")
    </head>
    <body>
    
       @Styles.Render("~/bundles/belowthefoldcss")
       @Scripts.Render("~/bundles/js")
    </body>
    <html>

Please note if you are running on debug mode, it will load the files separately. Bundling and minification occurs for when compilation is on release mode.

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