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public class Startup
    {
        public Startup()
        {
            var builder = new ConfigurationBuilder().
                    AddJsonFile("appsettings.json");
            Configuration = builder.Build();
        }

        public IConfiguration Configuration { get; set; }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddIdentity<User, IdentityRole>().AddEntityFrameworkStores<OdeToFoodDbContext>();
            services.AddDbContext<OdeToFoodDbContext>(opt => opt.UseSqlServer(Configuration["database:connection"]));
            services.AddScoped<IRestaurantData, SqlRestaurantData>();
            services.AddMvc();
            services.AddSingleton(iServiceProvicer => Configuration);
            services.AddSingleton<IGreeter, Greeter>();
        }

        // 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,IGreeter greeter)
        {
            loggerFactory.AddConsole();
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseStatusCodePages();

            app.UseFileServer();

            app.UseIdentity();
            app.UseMvc(configureRoutes);
            app.Run(async (context) =>
            {
                var greeting = greeter.GetGreeting();
                await context.Response.WriteAsync(greeting);
            });
        }

        private void configureRoutes(IRouteBuilder routeBuilder)
        {
            routeBuilder.MapRoute("default", "{controller=Home}/{action=Index}/{id?}");
        }
    }

{
  "greeting": "A configurable hello, to you!",
  "database": {
    "connection": "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=OdeToFood;"
  }
}

public class AccountController:Controller
    {
        private UserManager<User> _userManager;
        private SignInManager<User> _signInManager;

        public AccountController(UserManager<User> userManager,SignInManager<User> signInManager)
        {
            _userManager = userManager;
            _signInManager = signInManager;
        }

        [HttpGet]
        public ViewResult Register()
        {
            return View();
        }

        [HttpPost]
        public async Task<IActionResult> Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new User { UserName = model.Username };
                var result=await _userManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    await _signInManager.SignInAsync(user, false);
                    return RedirectToAction("Index", "Home");
                }
                else
                {
                    foreach (var error in result.Errors)
                    {
                        ModelState.AddModelError("", error.Description);
                    }
                }
            }
            return View(model);
        }
    }

@model RegisterViewModel
@{ 
    ViewBag.Title = "Register";
}

<h1>Register</h1>
<form method="post" asp-action="Register" asp-controller="Account">
    <div asp-validation-summary="ModelOnly"></div>
    <div>
        <label asp-for="Username"></label>
        <input asp-for="Username"/>
        <span asp-validation-for="Username"></span>
    </div>
    <div>
        <label asp-for="Password"></label>
        <input asp-for="Password" />
        <span asp-validation-for="Password"></span>
    </div>
    <div>
        <label asp-for="ConfirmPassword"></label>
        <input asp-for="ConfirmPassword" />
        <span asp-validation-for="ConfirmPassword"></span>
    </div>
    <div>
        <input type="submit" value="Register"/>
    </div>
</form>

using System.ComponentModel.DataAnnotations;

namespace OdeToFood.ViewModels
{
    public class RegisterViewModel
    {
        [Required,MaxLength(256)]
        public string Username { get; set; }
        [Required,DataType(DataType.Password)]
        public string Password { get; set; }
        [Required,DataType(DataType.Password), Compare(nameof(Password))]
        public string ConfirmPassword { get; set; }

    }
}

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;

namespace OdeToFood.Entities
{
    public class OdeToFoodDbContext:IdentityDbContext<User>
    {
        public OdeToFoodDbContext(DbContextOptions<OdeToFoodDbContext> options):base(options)
        {

        }
        public DbSet<Restaurant> Restaurants{ get; set; }
    }
}