Why file operations matter in C Sharp (C#) - See It in Action

Why file operations matter

📖 Scenario: Imagine you are creating a simple program to keep track of your favorite books. You want to save the list of books to a file so you can see it later, even after closing the program.

🎯 Goal: You will create a program that writes a list of book titles to a file, then reads the file and shows the saved books on the screen.

📋 What You'll Learn

Create a list of book titles

Create a file path string to save the books

Write the list of books to the file

Read the books from the file and display them

💡 Why This Matters

🌍 Real World

Saving and reading data from files is common in many programs, like saving user settings, logs, or lists of items.

💼 Career

Understanding file operations is important for software developers to manage data storage and retrieval in applications.

1

Create a list of book titles

Create a List<string> called books with these exact titles: "The Hobbit", "1984", "Pride and Prejudice".

C Sharp (C#)

# Create the list of books below
// Your code here

Need a hint?

Use List<string> and initialize it with the three book titles inside curly braces.

2

Create a file path to save the books

Add a string variable called filePath and set it to "books.txt".

C Sharp (C#)

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List books = new List { "The Hobbit", "1984", "Pride and Prejudice" };
        // Create the filePath string below
        // Your code here
    }
}

Need a hint?

Use string filePath = "books.txt"; to set the file name.

3

Write the list of books to the file

Use System.IO.File.WriteAllLines with filePath and books to save the book titles to the file.

C Sharp (C#)

using System;
using System.Collections.Generic;
using System.IO;

class Program
{
    static void Main()
    {
        List books = new List { "The Hobbit", "1984", "Pride and Prejudice" };
        string filePath = "books.txt";
        // Write the books list to the file below
        // Your code here
    }
}

Need a hint?

Use File.WriteAllLines(filePath, books); to save the list to the file.

4

Read the books from the file and display them

Use File.ReadAllLines with filePath to read the books into a string[] called savedBooks. Then use a foreach loop to print each book with Console.WriteLine.

C Sharp (C#)

using System;
using System.Collections.Generic;
using System.IO;

class Program
{
    static void Main()
    {
        List books = new List { "The Hobbit", "1984", "Pride and Prejudice" };
        string filePath = "books.txt";
        File.WriteAllLines(filePath, books);
        // Read the books from the file and print each one below
        // Your code here
    }
}

Need a hint?

Use string[] savedBooks = File.ReadAllLines(filePath); and then a foreach loop to print each book.