Startup.cs

using Encyclopedia_Of_Laws.Data;
using Encyclopedia_Of_Laws.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using NToastNotify;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Encyclopedia_Of_Laws
{
    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.AddDbContext<EncyclopediaOfLawsContext>(options =>
           options.UseSqlServer(
               Configuration.GetConnectionString("EncyclopediaOfLawsContext"))          
           );

            services.AddMvc().AddNToastNotifyToastr(new ToastrOptions()
            {
                ProgressBar = true,
                PositionClass = ToastPositions.TopRight,
                PreventDuplicates = true,
                CloseButton = true
            });

            services.AddControllersWithViews();


            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<EncyclopediaOfLawsContext>()
                .AddDefaultTokenProviders();

        }

        // 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");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }
            app.UseHttpsRedirection();

            app.UseDeveloperExceptionPage();
            app.UseDefaultFiles();
            app.UseStaticFiles();
            app.UseRouting();

            app.UseCookiePolicy();;

            app.UseAuthentication();
            app.UseAuthorization();

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