Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

using Microsoft.EntityFrameworkCore;
using sportstore.Models;
using Microsoft.AspNetCore.Identity;

namespace sportstore
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews();
            services.AddDbContext<Context>(options =>
                options.UseNpgsql(
                    Configuration.GetConnectionString("postgres"),
                    options => options.SetPostgresVersion(new Version(9,6))
                )
            );
            services.AddIdentity<IdentityUser, IdentityRole>(
                config =>
                {
                    config.Password.RequiredLength = 4;
                    config.Password.RequireDigit = false;
                    config.Password.RequireNonAlphanumeric = false;
                    config.Password.RequireUppercase = false;
                }
            ).AddEntityFrameworkStores<Context>().AddDefaultTokenProviders();
            services.ConfigureApplicationCookie(
                config =>
                {
                    config.Cookie.Name = "Akun";
                    config.LoginPath = "/Login/Login";   //di views?
                }
            );
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }
            app.UseStaticFiles();

            app.UseRouting();           //for moves page

            //siapa?
            app.UseAuthentication();

            //diijinkan?
            app.UseAuthorization();
            //setelah insert di databasenya
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapAreaControllerRoute(
                    name: "AdminArea",
                    areaName : "Admin",
                    pattern: "Admin/{controller=Product}/{action=Index}/{id?}");
                
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}