User Registration and Login [written by Gabs]

A very simple membership class library for your .NET/C# application with Entity Framework 6 Code-First.



Property Type Description
Id int A database-generated unique number which identifies the user
Email string Unique username or email
Password Hash/Salt byte[] Encrypted password data [read only]
LastLogin Nullable DateTime The last successful login of the user
Roles string Comma-separated role(s) of a user
UserProfiles any You can add more user profile data e.g. FirstName, LastName, BirthDate, Gender, Phone, Address, etc

Public Static Methods

Method Type Description
Create(User, strUserPassword, optional requiresActivation) User Creates new User. Return null if registration fails. requiresActivation set to true needs account be activated by the Administrator
Authenticate(userEmail, userPassword) bool Returns true if login is valid
Update(User, optional userPassword, optional newPassword) User Updates the user. This also serves as ChangePassword if parameter userPass and newPass are not empty
GetAll() List<User> Returns all users
GetAllUsersInRole(rolename) List<User> Returns all users belong to a role
GetUserById(id) User Returns User by Id
GetUserByEmail(email) User Returns User by email or username
GetCurrentUser() User Returns currently logged-in user
GetUserRoles(id or email) string[] Returns the roles of user as string array
Deactivate() User Disables user from logging in
Activate() User Re-enables user


Copy paste User.cs in your project and set the username and password for the auto-generated default administrator. The code below automatically creates user with username, password, and role set to “admin”.

private const string DEFAULT_ADMIN_LOGIN = "admin";

Then change the type of _db instance to your app DbContext.

 private static MyDbContext _db = new MyDbContext();

In your DbContext class, add database mapping to User class

 public DbSet<User> Users { get; set; }

Execute update-database


Sign up

public void Register()
    if (txtPassword.Text == txtVerifyPass.Text)
        User newUser = new User();
        newUser.Email = txtEmail.Text;
        newUser.FirstName = txtFirstName.Text;
        newUser.LastName = txtLastName.Text;
        newUser.Phone = txtPhone.Text;
        var user = User.Create(newUser, txtPassword.Text);
        if (user != null)
            MessageBox.Show("You have successfully registered. \nUserId: " + user.Id);
            // Logic for successful registration...
            MessageBox.Show("Registration failed.");
        MessageBox.Show("Password is not the same.");


Sign in

public void Login()
    var valid = User.Authenticate(txtLoginEmail.Text, txtLoginPassword.Text);
        var currentUser = User.GetCurrentUser();
        MessageBox.Show("Hello " + currentUser.FirstName + ", you have successfully logged in to the system.");
        // Do what you want to do as login is successful...
        MessageBox.Show("Invalid email and/or password.");