🔐 C# Console Login System

A simple username/password authentication program built in C#. This project demonstrates console input/output, conditional logic, recursion, and basic credential validation. Ideal for beginners learning C# fundamentals and method encapsulation.

Overview

Users enter a username and password, which are validated against predefined credentials. If incorrect, the program prompts again until the correct credentials are entered. Once validated, the user gains access.

Concepts demonstrated:

• Console input/output (Console.ReadLine)
• Conditional statements (if)
• Recursion to re-attempt login
• Method encapsulation
• Program flow control

Features

• Username & password input via console
• Hardcoded credential validation
• Retry mechanism with recursion
• Clean structure using Login() method
• Beginner-friendly and extendable

Code Example

using System;

class Program
{
    static void Login()
    {
        string correctUsername = "Sean";
        string correctPassword = "Kamehameha!";

        Console.Write("Enter Username: ");
        string username = Console.ReadLine();

        Console.Write("Enter Password: ");
        string password = Console.ReadLine();

        if (username != correctUsername || password != correctPassword)
        {
            Console.WriteLine("Invalid Input! Please Try Again!\n");
            Login();
            return;
        }

        Console.WriteLine("Welcome to the System!");
    }

    static void Main(string[] args)
    {
        Login();
    }
}

How to Run

1. Install .NET SDK (6.0+).
2. Clone the repository:
3. Navigate to the project folder:

   git clone https://github.com/your-username/your-repo.git
   

4. Run the program:

   dotnet run
   

Future Enhancements

• Hashed password storage
• Support for multiple user accounts
• Login attempt limits and lockout timers
• File or database-based credential storage
• Replace recursion with loops for scalability