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.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Crime.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;

namespace Crime
{
  public class Startup
  {
    public IConfiguration Configuration { get; }

    public Startup(IConfiguration config) => Configuration = config;

    public void ConfigureServices(IServiceCollection services)
    {
      services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
      services.AddDbContext<AppIdentityDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

      services.AddIdentity<IdentityUser, IdentityRole>().AddEntityFrameworkStores<AppIdentityDbContext>();

      services.ConfigureApplicationCookie(options => {
        options.LoginPath = "/Home/Login"; 
        options.AccessDeniedPath = "/Home/AccessDenied";
      });

      services.AddTransient<ICrimeRepository, EFCrimeRepository>();

      services.AddControllersWithViews();
    //  services.AddHttpContextAccessor();
      services.AddSession();
      services.AddRazorPages()
       .AddRazorRuntimeCompilation();
    }

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

      app.UseStatusCodePages();
      app.UseStaticFiles();

      app.UseRouting();
      app.UseSession();

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

      app.UseEndpoints(endpoints =>
      {
        endpoints.MapDefaultControllerRoute();
      });
    }
  }
}