Startup.cs

using Umbraco.Core;


namespace MyUmbracoWebsite
{
    public class Startup : ApplicationEventHandler
    {
        protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
        {
            StaticFileHasher.HashFiles(umbracoApplication.Server.MapPath("~/css"), umbracoApplication.Server.MapPath("~/js"));
        }
       
    }
}