Create Registration and Login using Identity in Asp.Net Core

In this Article we will learn How to Create Registration and Login using Identity in Asp.Net Core.

Table of Contents

Prerequisites

Download and install .Net Core 6.0 SDK from here
Download and Install Microsoft Visual Studio 2022 from here

Create ASP.NET Core Web App

Open visual studio and click the Create New Project Option
Select the Blank Template

Enter the name of the Project

Select framework and Click on Create

Install NuGet Packages

Microsoft.AspNetCore.Identity.EntityFramework
Microsoft.EntityFrameworkCore
Microsoft.EntityFrameworkCore.InMemory

DbContext Class

DbContext Class. The DbContext is used for accessing application data through Entity Framework Core. You need to create DbContext class that derives from “IdentityDbContext” class

using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
namespace Auth_Identity_Login.Services
{
    //Identity contains all user table to inherits
    public class AppDbContext : IdentityDbContext 
    {
        public AppDbContext(DbContextOptions<AppDbContext> option)
            :base(option)
        {
        }
    }
}

Create View Model

using System.ComponentModel.DataAnnotations;
namespace Auth_Identity_Login.Models
{
    public class UserViewModel
    {
        [Key]
        public int userid { get; set; }       
        public string username { get; set; }
        public string Email { get; set; }
        public string password { get; set; }    
    }
}

Program.cs

using Auth_Identity_Login.Services;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddControllersWithViews();
builder.Services.AddDbContext<AppDbContext>(config=>
    {
        config.UseInMemoryDatabase("Memory");
});
builder.Services.AddIdentity<IdentityUser, IdentityRole>(config=>
{
    config.Password.RequiredLength = 5;
    config.Password.RequireDigit = false;
    config.Password.RequireNonAlphanumeric = false;
    config.Password.RequireUppercase = false;
})
    .AddEntityFrameworkStores<AppDbContext>()
    .AddDefaultTokenProviders();
builder.Services.ConfigureApplicationCookie(config =>
{
    config.Cookie.Name = "Auth_Tutorial";
    config.LoginPath = "/Home/Login";
});
 
builder.Services.AddMvc();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/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.UseStaticFiles();
app.UseAuthentication();
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoint =>
{
    endpoint.MapDefaultControllerRoute();
});
app.Run();

Previous Article also you can check ASP.Net Core Authentication and Authorization Basics in .Net Core 6.0

Create Controller

Create the Home Controller

using Auth_Identity_Login.Models;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using System.Security.Claims;
namespace Auth_Identity_Login.Controllers
{
    public class HomeController : Controller
    {
        private readonly UserManager<IdentityUser> _userManager;
        private readonly SignInManager<IdentityUser> _signInManager;
        public HomeController(UserManager<IdentityUser> userManager,SignInManager<IdentityUser> signInManager)
        {
            _userManager = userManager;   
            _signInManager = signInManager;
        }
        public IActionResult Index()
        {
            return View();
        }
         
        public IActionResult Register()
        {
            return View();
        }
        public IActionResult Login()
        {
            return View();
        }
        [HttpPost]
        public async Task<IActionResult> Login(UserViewModel model)
        {
            var user = await _userManager.FindByNameAsync(model.username);
            try
            {
                           
            if (user != null)
            {
              var SignInResult = await _signInManager.PasswordSignInAsync(user, model.password,false,false);
            
            if (SignInResult.Succeeded)
            {
                    TempData["Message"] = "Logged In";
                    return RedirectToAction(nameof(Index));
                }
            }
            }
            catch (Exception)
            {
                TempData["Message"] = "User doesn't Exist";
                return RedirectToAction(nameof(Index));
            }
            TempData["Message"] = "Login Fail";
            return RedirectToAction(nameof(Index));
        }
        [HttpPost]
        public async Task<IActionResult> Register(UserViewModel model)
        {
            var userinfo = new IdentityUser
            {
                UserName = model.username,
                Email = string.Empty,
            };
           var userresult = await  _userManager.CreateAsync(userinfo,model.password);
            if (userresult.Succeeded)
            {
                var SignInResult = await _signInManager.PasswordSignInAsync(userinfo, model.password, false, false);
                if (SignInResult.Succeeded)
                {
                    TempData["Message"] = "User Registered";
                    return RedirectToAction(nameof(Index));
                }
            }
            TempData["Message"] = "User Registeration Fail";
            return RedirectToAction(nameof(Index));
        }
            
        public async Task<IActionResult> LogOut()
        {
            await _signInManager.SignOutAsync();
            return RedirectToAction(nameof(Index));
        }
        
              
       
    }
}

Create View

Index.cshtml

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}
 
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" />
<br/>
<div class="container-fluid">
<div class="btn-group">
         
    <a asp-controller="Home" asp-action="Register" class="btn-primary">Register</a>
    <br/>
    <a asp-controller="Home" asp-action="Login" class="btn-primary">Login</a>
        <h1>@TempData["Message"]</h1>
    </div>
</div>

Login.cshtml

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}
 
<html>
<head>
    <link rel="stylesheet" href="~/css/Style.css" />
</head>
<body>
    <div class="login">
        <h1>Login</h1>
        <form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="Login">
            <p><input type="text" name="username" value="" placeholder="Username or Email" required></p>
            <p><input type="password" name="password" value="" placeholder="Password" required></p>
            <p class="remember_me">
                <label>
                    <input type="checkbox" name="remember_me" id="remember_me">
                    Remember me on this computer
                </label>
            </p>
            <p class="submit"><input type="submit" name="commit" value="Login"></p>
            <hr />
             
        </form>
    </div>
</body>
</html>

Register.cshtml

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}
@model Auth_Identity_Login.Models.UserViewModel
<html>
<head>
    <link rel="stylesheet" href="~/css/Style.css" />
</head>
<body>
    <div class="login">
        <h1>User Registeration</h1>
        <form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="Register">
            <p><input type="text" name="username" value="" placeholder="Username or Email" required></p>
            <p><input type="password" name="password" value="" placeholder="Password" required></p>
            <p class="remember_me">
                <label>
                    <input type="checkbox" name="remember_me" id="remember_me">
                    Remember me on this computer
                </label>
            </p>
            <p class="submit"><input type="submit" name="commit" value="Submit"></p>
            <hr />
            
        </form>
    </div>
</body>
</html>