Read-only and write-only properties in C Sharp (C#) - Mini Project: Build & Apply

Read-only and Write-only Properties in C#

📖 Scenario: You are creating a simple user profile system where some information should be visible but not changeable, and some information should be set but not visible directly.

🎯 Goal: Build a C# class with a read-only property and a write-only property to control access to user data.

📋 What You'll Learn

Create a class called UserProfile

Add a private string field called username

Add a private string field called password

Create a read-only property Username that returns the username

Create a write-only property Password that sets the password

Create a method DisplayInfo that prints the username and a message about the password

💡 Why This Matters

🌍 Real World

Read-only and write-only properties are used in real applications to protect sensitive data like usernames and passwords, ensuring users can see or set data only in allowed ways.

💼 Career

Understanding property access control is important for software developers to write secure and maintainable code, especially when handling user data.

1

Create the UserProfile class with private fields

Create a class called UserProfile with two private string fields: username and password. Initialize username to "Alice" and password to "" (empty string).

C Sharp (C#)

class UserProfile
{
    // Your code here
}

Need a hint?

Use private string username = "Alice"; and private string password = ""; inside the class.

2

Add read-only and write-only properties

Inside the UserProfile class, add a read-only property called Username that returns the username field, and a write-only property called Password that sets the password field.

C Sharp (C#)

class UserProfile
{
    private string username = "Alice";
    private string password = "";

    // Your code here
}

Need a hint?

Use public string Username { get { return username; } } and public string Password { set { password = value; } }.

3

Add a method to display user info

Add a public method called DisplayInfo inside UserProfile that prints the username and the message "Password is set" if the password is not empty, otherwise "Password is not set".

C Sharp (C#)

class UserProfile
{
    private string username = "Alice";
    private string password = "";

    public string Username
    {
        get { return username; }
    }

    public string Password
    {
        set { password = value; }
    }

    // Your code here
}

Need a hint?

Use System.Console.WriteLine to print the username and check if password is empty or not.

4

Create an instance, set password, and display info

In the Main method, create an instance of UserProfile called user. Set the Password property to "secret123". Then call DisplayInfo() on user to print the username and password status.

C Sharp (C#)

class UserProfile
{
    private string username = "Alice";
    private string password = "";

    public string Username
    {
        get { return username; }
    }

    public string Password
    {
        set { password = value; }
    }

    public void DisplayInfo()
    {
        System.Console.WriteLine($"Username: {username}");
        if (password != "")
            System.Console.WriteLine("Password is set");
        else
            System.Console.WriteLine("Password is not set");
    }
}

class Program
{
    static void Main()
    {
        // Your code here
    }
}

Need a hint?

Create UserProfile user = new UserProfile();, set user.Password = "secret123";, then call user.DisplayInfo();.