Creating Login Form With Authentication For User Login Using C#

Step 5. In the Solution Explorer, select Form1.cs which is the workspace for our creation. Start to code inside the Main method. This is my code in which I have included how the tools will be reacting when the project is run.

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 login_form
{
    public partial class Form1 : Form
    {
        static int attempt = 3;
        public Form1()
        {
            InitializeComponent();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string username = textBox1.Text;
            string password = textBox2.Text;
            if ((this.textBox1.Text == "Admin") && (this.textBox2.Text == "admin"))
            {
                attempt = 0;
                pictureBox1.Image = new Bitmap(@"C:\Users\Mic 18\Desktop\granted.jpg");
                MessageBox.Show("you are granted with access");
            }
            else if ((attempt == 3) && (attempt > 0))
            {
                pictureBox1.Image = new Bitmap(@"C:\Users\Mic 18\Desktop\images1.jpg");
                label4.Text = ("You Have Only " + Convert.ToString(attempt) + " Attempt Left To Try");
                --attempt;
            }
            else
            {
                pictureBox1.Image = new Bitmap(@"C:\Users\Mic 18\Desktop\denied.jpg");
                MessageBox.Show("you are not granted with access");
            }
        }
    }
}

Step 6. The completed form looks like this and it is now running. To start the application, press F5. The user who uses this form will type the username and desired password to enter into the next level.

Step 7. By typing the correct username and password and clicking the LOGIN button, the picture box changes the default picture with a different picture, and a message box is prompted telling about the code validation so that the user can start accessing the application further.

Step 8. If the user types the wrong username or password, the label under the picture box displays a message with the number of attempts left out for the user to try.

Step 9. I have limited the user entry to only three attempts. The code checks for the correct entry in username and password. If all three attempts contain either the wrong username or wrong password, the user will not be allowed to continue his/her process with the application. This is shown in the below picture.

Summary

In the above steps, I have explained how to create a simple login form using C# in the Windows Form Application and validating the username and password with limited attempts as well as changing the pictures according to the type of user. I have explained a scenario with only one user login. Future enhancements will be including a database with usernames and passwords where we can add any number of users and respective passwords.