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.Logging;
using Microsoft.EntityFrameworkCore;
using PutNet.Web.Identity.Database;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;

namespace PutNet.Web.Identity
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            var connectionString = "Server=localhost;Database=IdentityDemo;Trusted_Connection=True;";

            services.AddEntityFrameworkSqlServer()
                    .AddDbContext<DemoContext>(o => o.UseSqlServer(connectionString))
                    .AddIdentity<User, IdentityRole>(options => {
                        // Password settings
                        options.Password.RequireDigit = true;
                        options.Password.RequiredLength = 8;
                        options.Password.RequireNonAlphanumeric = false;
                        options.Password.RequireUppercase = true;
                        options.Password.RequireLowercase = false;
                        
                        // Lockout settings
                        options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(30);
                        options.Lockout.MaxFailedAccessAttempts = 10;
                        
                        // Cookie settings
                        options.Cookies.ApplicationCookie.ExpireTimeSpan = TimeSpan.FromDays(150);
                        options.Cookies.ApplicationCookie.LoginPath = "/Account/LogIn";
                        options.Cookies.ApplicationCookie.LogoutPath = "/Account/LogOut";
                        
                        // User settings
                        options.User.RequireUniqueEmail = true;
                    })
                    .AddEntityFrameworkStores<DemoContext>()
                    .AddDefaultTokenProviders();

            // Add framework services.
            services.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();

            app.UseIdentity();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}