Create Login(Sign In) and Registration (Sign Up) Form in C# Windows Form With Database

Introduction

Hello guys, in this article we will create a login and registration form with database in c# windows form application .In this article we create a windows form app with login page, registration page for create new account and home page which show message that you login successfully .I hope you will like this article .So let’s start step by step.

Step: 1:- Open your visual studio, here I will use visual studio 2019.

Step: 2:- Clock on file menu on top of the visual studio, hover mouse on new and click on project.

Step: 3:- Search for windows form App.(.Net framework) and click on next.

Step: 4:- In this step you have to enter some details of your application and then click on Create button. Following details you have to enter.

1.    Project Name: Name of your project

2.    Location: Location where you want to store your app in your local computer.

3.    Solution Name: This name is display in solution explore in visual studio.

4.    Framework: Select appropriate framework as your application require.

Step: 5:- Now your project is created. Open Solution Explorer .If you don’t see solution explore you can open from View menu on top or you can try short cut key “Ctrl+W,S”. We need to create some pages for our application. Right click on solution name then Hover mouse on Add and click on Add New Item or you can user short cut key “Ctrl+Shift+A”.

Step: 6:- Now you see a dialog where we add our forms. Select Windows Form, give proper name and click on Add. Add Login, Registration and Home page in same way.

Step: 7:- Now we need to add database in our project. Right click on solution name then Hover mouse on Add and click on Add New Item or you can user short cut key “Ctrl+Shift+A”. Select data filter from left side bar for see item which associate with database. Select service based database, give name and click on add.

Step: 8:- Now we create a table which we user in login and registration. Double click on database file from solution explorer. It will open database file in server explore. Expand your database and right click on table then click on Add New Table.

Step: 9:-Create table field which you want, here I added only three field Id, UserName and password where id is auto increment by 1. You can set it by right click on field name , click on property and find Id Identity Specification expand it make true (Is Identity) field and give increment number which increment id by adding this number in last id.

Step:-10:- Now first of all we create Registration form. So create design of your form as you need. In below image you see how I design form.

Step: 11:- Now click anywhere on form it will generate Form_Load event where enter following code. This code create database connection and open it. In next step you will learn how you get that connection string which added in SQLConnection Constructor.

Step: 12:- Go to server Explorer right click on database, click on Modify Connection.

Step: 13:- Now you see a windows dialog popup click on advance button. This will open another dialog. But Before that click on test button and check you database working properly.

Step: 14:- Copy path which show below on this dialog and close both dialog. Then past this path in form load event. Add @ sign before this path so you no need to change slash.

Step: 15:- We need to open login page when user click on login button so enter following code in Login Button click event.

Code Explanation:

1.    Here first we hide the current form which is registration .

2.    Then we create an object of login page and show login form using that object.

Step: 16:- Now add following code in registration button click event

Code Explanation:

1.    First of all we check that user enter value in all field if yes that continue otherwise show message using message box.

2.    Then we check if password and confirm password both are same.

3.    Then we check if any record/user is already register with that username if not then continue further otherwise show error message.

4.    In last we insert data in table using SQLCommand object.

Step: 17:- Now we create a login page here I add two textbox for username and password and two button for login and open registration form.

Step: 18:- Click on anywhere in form which generate Form_Load event add connection code that as show below.

Step: 19:- On Registration button click  add following code which open registration form.

Step: 20:- Add below code in login button click for redirect user to home page form if user exist.

Code Explanation

1.    Here first of all we check if user enter value in both field if yes then continue otherwise show error message.

2.    Then we check if user exist in our database with that username and password. If user exist then open home page which we generate in start.

Step: 21:-Change start page as login in Program.cs File.

 Step: 22:-Now run your application.

Login.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RegistrationAndLogin
{
    public partial class Login : Form
    {
        SqlCommand cmd;
        SqlConnection cn;
        SqlDataReader dr;

        public Login()
        {
            InitializeComponent();
        }

        private void Login_Load(object sender, EventArgs e)
        {
            cn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\Articles\Code\RegistrationAndLogin\Database.mdf;Integrated Security=True");
            cn.Open();
        }

        private void Btnregister_Click(object sender, EventArgs e)
        {
            this.Hide();
            Registration registration = new Registration();
            registration.ShowDialog();
        }

        private void BtnLogin_Click(object sender, EventArgs e)
        {
            if (txtpassword.Text != string.Empty || txtusername.Text != string.Empty)
            {

                cmd = new SqlCommand("select * from LoginTable where username='" + txtusername.Text + "' and password='"+txtpassword.Text+"'", cn);
                dr = cmd.ExecuteReader();
                if (dr.Read())
                {
                    dr.Close();
                    this.Hide();
                    Home home = new Home();
                    home.ShowDialog();
                }
                else
                {
                    dr.Close();
                    MessageBox.Show("No Account avilable with this username and password ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }

            }
            else
            {
                MessageBox.Show("Please enter value in all field.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

    }
}

Registration.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RegistrationAndLogin
{
    public partial class Registration : Form
    {

        SqlCommand cmd;
        SqlConnection cn;
        SqlDataReader dr;

        public Registration()
        {
            InitializeComponent();
        }

        private void Registration_Load(object sender, EventArgs e)
        {
            cn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=D:\Articles\Code\RegistrationAndLogin\Database.mdf;Integrated Security=True");
            cn.Open();
        }

        private void BtnRegister_Click(object sender, EventArgs e)
        {
            if (txtconfirmpassword.Text != string.Empty || txtpassword.Text != string.Empty || txtusername.Text != string.Empty)
            {
                if (txtpassword.Text == txtconfirmpassword.Text)
                {
                    cmd = new SqlCommand("select * from LoginTable where username='" + txtusername.Text + "'", cn);
                    dr = cmd.ExecuteReader();
                    if (dr.Read())
                    {
                        dr.Close();
                        MessageBox.Show("Username Already exist please try another ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                    else
                    {
                        dr.Close();
                        cmd = new SqlCommand("insert into LoginTable values(@username,@password)", cn);
                        cmd.Parameters.AddWithValue("username", txtusername.Text);
                        cmd.Parameters.AddWithValue("password", txtpassword.Text);
                        cmd.ExecuteNonQuery();
                        MessageBox.Show("Your Account is created . Please login now.", "Done", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
                else
                {
                    MessageBox.Show("Please enter both password same ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
            else
            {
                MessageBox.Show("Please enter value in all field.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            this.Hide();
            Login login = new Login();
            login.ShowDialog();
        }
    }
}

Home.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RegistrationAndLogin
{
    public partial class Home : Form
    {
        public Home()
        {
            InitializeComponent();
        }
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace RegistrationAndLogin
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Login());
        }
    }
}

Conclusion

So, here we create a simple login and registration page in windows form application. I hope you like this article, share with your friends.