Login and Register using ASP.NET MVC 5

#csharp #webdev

Today, I'm shared everyone a simple Login & Register in ASP.NET MVC 5

Step 1: Open Visual Studio 2019, File->New->Project
Step 2: Select ASP.NET Web Application(.NEt Framework)
Step 3: Enter name "Project"
Step 4: Choose Empty->checkbox MVC->Create

Okay,after when install project successfuly, now we can install **(EntityFramework,Bootstrap), you opent Nuget Packager Manager->search install it
You can again see: ASP.NET MVC 5 Install Bootstrap

If you install (EntityFramework, Bootstrap) success, continue create database in Project
Click right App_data->add database (name="DatabaseMVC5")

Configuation models, create User.cs class in Models directory



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
namespace ProjectMVC5.Models
{
    public class User
    {
        [Key, Column(Order = 1)]
        [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
        public int idUser { get; set; }
        [Required]
        [StringLength(50, MinimumLength = 3)]
        public string FirstName { get; set; }
        [Required]
        [StringLength(50, MinimumLength = 3)]
        public string LastName { get; set; }
        [Required]
        [RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}")]
        public string Email { get; set; }

        [Required]
        [RegularExpression(@"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,15}$")]

        public string Password { get; set; }

        [NotMapped]
        [Required]
        [System.ComponentModel.DataAnnotations.Compare("Password")]
        public string ConfirmPassword { get; set; }
        public string FullName()
        {
            return this.FirstName + " " + this.LastName;
        }
    }
}

You can seen Form Validation

Ok, configuation extends DBcontext class, create DB_Entities.cs file in Models directory
+ Models/DB_Entities.cs



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
namespace ProjectMVC5.Models
{
    public class DB_Entities: DbContext
    {
        public DB_Entities() : base("DatabaseMVC5") { }
        public DbSet<User> Users { get; set; }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            //Database.SetInitializer<demoEntities>(null);
            modelBuilder.Entity<User>().ToTable("Users");
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

            base.OnModelCreating(modelBuilder);


        }
    }
}

You need insert connectstring to SQL SERVER in Web.config.cs file



<connectionStrings>
    <add name="DatabaseMVC5" connectionString="Data Source=(LocalDb)\MSSQLLocalDB;Initial Catalog=DatabaseMVC5;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\DatabaseMVC5.mdf" providerName="System.Data.SqlClient" />
  </connectionStrings>

Okey, now we can create HomeController.cs in Controllers directory,

Controllers/HomeController.cs ```csharp

using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ProjectMVC5.Models;
using System.Security.Cryptography;
namespace ProjectMVC5.Controllers
{
public class HomeController : Controller
{
private DB_Entities _db = new DB_Entities();
// GET: Home
public ActionResult Index()
{
if (Session["idUser"] != null)
{
return View();
}
else
{
return RedirectToAction("Login");
}
}

    //GET: Register

    public ActionResult Register()
    {
        return View();
    }

    //POST: Register
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Register(User _user)
    {
        if (ModelState.IsValid)
        {
            var check = _db.Users.FirstOrDefault(s => s.Email == _user.Email);
            if (check == null)
            {
                _user.Password = GetMD5(_user.Password);
                _db.Configuration.ValidateOnSaveEnabled = false;
                _db.Users.Add(_user);
                _db.SaveChanges();
                return RedirectToAction("Index");
            }
            else
            {
                ViewBag.error = "Email already exists";
                return View();
            }


        }
        return View();


    }

    public ActionResult Login()
    {
        return View();
    }



    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Login(string email,string password)
    {
        if (ModelState.IsValid)
        {


            var f_password = GetMD5(password);
            var data =_db.Users.Where(s => s.Email.Equals(email) && s.Password.Equals(f_password)).ToList();
            if (data.Count() > 0)
            {
                //add session
                Session["FullName"] = data.FirstOrDefault().FirstName +" "+ data.FirstOrDefault().LastName;
                Session["Email"] = data.FirstOrDefault().Email;
                Session["idUser"] = data.FirstOrDefault().idUser;
                return RedirectToAction("Index");
            }
            else
            {
                ViewBag.error = "Login failed";
                return RedirectToAction("Login");
            }
        }
        return View();
    }


    //Logout
    public ActionResult Logout()
    {
        Session.Clear();//remove session
        return RedirectToAction("Login");
    }



    //create a string MD5
    public static string GetMD5(string str)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] fromData = Encoding.UTF8.GetBytes(str);
        byte[] targetData = md5.ComputeHash(fromData);
        string byte2String = null;

        for (int i = 0; i < targetData.Length; i++)
        {
            byte2String += targetData[i].ToString("x2");

        }
        return byte2String;
    }

}

}

**Register():** use Submit form add User to database
**Login():** check infomation people in database
**GetMD5():** create md5 string password

Create **Register.cshtml** file in **Views/Home** directory
```csharp


@model ProjectMVC5.Models.User

@{
    ViewBag.Title = "Register";
    Layout = "~/Views/Shared/_LayoutPage1.cshtml";
}
<div class="row justify-content-md-center">
    <div class="col-md-5">
        @using (Html.BeginForm("Register", "Home", FormMethod.Post))
        {
            //@Html.ValidationSummary()
            @Html.AntiForgeryToken()

            <div class="card">
                <div class="card-header">
                    <div class="card-title">Register</div>
                </div>
                <div class="card-body">
                    <div class="form-group">
                        @Html.LabelFor(m => m.FirstName)
                        @Html.TextBoxFor(m => m.FirstName, "", new { @class = "form-control", @placeholder = "First Name" })
                        @Html.ValidationMessageFor(m => m.FirstName, "", new { @class = "badge badge-danger" })
                    </div>
                    <div class="form-group">
                        @Html.LabelFor(m => m.LastName)
                        @Html.TextBoxFor(m => m.LastName, "", new { @class = "form-control", @placeholder = "Last Name" })
                        @Html.ValidationMessageFor(m => m.LastName, "", new { @class = "badge badge-danger" })

                    </div>
                    <div class="form-group">
                        @Html.LabelFor(m => m.Email)
                        @Html.TextBoxFor(m => m.Email, "", new { @class = "form-control", @placeholder = "Email" })
                        @Html.ValidationMessageFor(m => m.Email, "", new { @class = "badge badge-danger" })
                        @if (ViewBag.error != null)
                        {
                            <span class="badge badge-danger">@ViewBag.error</span>
                        }
                    </div>
                    <div class="form-group">
                        @Html.LabelFor(m => m.Password)
                        @Html.PasswordFor(m => m.Password, new { @class = "form-control", @placeholder = "Password" })
                        @Html.ValidationMessageFor(m => m.Password, "", new { @class = "badge badge-danger" })
                    </div>
                    <div class="form-group">
                        @Html.LabelFor(m => m.ConfirmPassword)
                        @Html.PasswordFor(m => m.ConfirmPassword, new { @class = "form-control", @placeholder = "Confim Password" })
                        @Html.ValidationMessageFor(m => m.ConfirmPassword, "", new { @class = "badge badge-danger" })
                    </div>
                    <div class="form-group">
                        <input type="submit" name="submit" class="btn btn-danger" value="Register"/>
                    </div>
                </div>
            </div>

        }
    </div>
</div>

Login.cshtml in Views/Home ```csharp

@model ProjectMVC5.Models.User

@{
ViewBag.Title = "Login";
Layout = "~/Views/Shared/_LayoutPage1.cshtml";
}

            Login


            @using (Html.BeginForm("Login", "Home", FormMethod.Post))
            {
                @Html.AntiForgeryToken()

                    @Html.LabelFor(m =&gt; m.Email)
                    @Html.TextBoxFor(m =&gt; m.Email, "", new { @class = "form-control", @placeholder = "Email" })



                    @Html.LabelFor(m =&gt; m.Password)
                    @Html.PasswordFor(m =&gt; m.Password, new { @class = "form-control", @placeholder = "Password" })




            }

+ Create **Index.cshtml** file in Views/Home/ directory
```csharp


@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_LayoutPage1.cshtml";
}
<div class="row justify-content-md-start">
    <div class="col-md-4">
        <div class="card">
            <div class="card-header">
                Wellcome
            </div>
            <div class="card-body">
                @if (Session["FullName"] != null)
                {
                    <p>Name: @Session["FullName"].ToString()</p>
                    <p>Email: @Session["Email"].ToString()</p>
                    <a href="@Url.Action("Logout","Home")" class="btn btn-warning">Logout</a>
                }
            </div>
        </div>

    </div>
</div>

Demo: