Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;

namespace ChannelGroupTabMVC
{
    class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc(options => options.EnableEndpointRouting = false);
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseRouting();
            app.UseMvc();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(name: "Default", pattern: "{controller=Home}/{action=Index}/{Id?}");
            });

            app.UseFileServer();
        }
    }
}