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Secure Login System with Limited Attempts in C#

This C# program implements a basic authentication system that asks the user to enter a username and password. The program enforces a security rule by allowing only a limited number of login attempts.

How the program works:
1. It prompts the user to enter a username.
2. It prompts the user to enter a password.
3. If the credentials are incorrect, the user is informed and asked to try again.
4. The user has a maximum of 5 attempts to enter the correct credentials.
5.If the user exceeds the allowed attempts, they receive a rejection message and the program terminates.
6. If the user enters the correct credentials before reaching 5 attempts, they are granted access.

This program demonstrates loop control, conditional statements, and basic security principles in C#.



Group

C# Basic Data Types Overview

Objective

Write a C# program that prompts the user for their username and password. Both should be strings. After 5 incorrect attempts, the user will be rejected.

Example C# Exercise

 Copy C# Code 
using System;

class Program
{
    static void Main()
    {
        // Correct credentials
        string correctUsername = "username";
        string correctPassword = "password";
        
        int maxAttempts = 5; // Maximum number of allowed attempts
        int attemptCount = 0; // Counter for attempts
        
        string enteredUsername, enteredPassword;

        while (attemptCount < maxAttempts)
        {
            // Prompt the user for username
            Console.Write("Enter your username: ");
            enteredUsername = Console.ReadLine();

            // Prompt the user for password
            Console.Write("Enter your password: ");
            enteredPassword = Console.ReadLine();

            // Check if the credentials match
            if (enteredUsername == correctUsername && enteredPassword == correctPassword)
            {
                Console.WriteLine("\nAccess granted. Welcome!");
                return; // Exit the program
            }
            else
            {
                attemptCount++;
                Console.WriteLine($"Incorrect username or password. Attempts left: {maxAttempts - attemptCount}\n");
            }
        }

        // If max attempts are reached
        Console.WriteLine("Too many failed attempts. Access denied.");
    }
}

 Output

//Example 1 (Incorrect Attempts Followed by Success):
Enter your username: admin
Enter your password: 1234
Incorrect username or password. Attempts left: 4

Enter your username: user
Enter your password: pass
Incorrect username or password. Attempts left: 3

Enter your username: username
Enter your password: password

Access granted. Welcome!

//Example 2 (Exceeding Maximum Attempts):
Enter your username: admin
Enter your password: 1234
Incorrect username or password. Attempts left: 4

Enter your username: user
Enter your password: pass
Incorrect username or password. Attempts left: 3

Enter your username: guest
Enter your password: 0000
Incorrect username or password. Attempts left: 2

Enter your username: test
Enter your password: abc
Incorrect username or password. Attempts left: 1

Enter your username: hacker
Enter your password: qwerty
Incorrect username or password. Attempts left: 0

Too many failed attempts. Access denied.

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More C# Practice Exercises of C# Basic Data Types Overview

Explore our set of C# Practice Exercises! Specifically designed for beginners, these exercises will help you develop a solid understanding of the basics of C#. From variables and data types to control structures and simple functions, each exercise is crafted to challenge you incrementally as you build confidence in coding in C#.