Writing text files in C Sharp (C#) - Mini Project: Build & Apply

Writing text files

📖 Scenario: You are creating a simple program to save a list of favorite fruits to a text file on your computer. This is useful when you want to keep a record of items that you can open later.

🎯 Goal: Build a C# program that writes a list of fruit names into a text file called fruits.txt.

📋 What You'll Learn

Create a list of fruit names

Set the file path to fruits.txt

Write the fruit names to the file, each on a new line

Print a confirmation message after writing

💡 Why This Matters

🌍 Real World

Saving lists or logs to text files is common in many applications, like saving user preferences, logs, or simple data records.

💼 Career

Knowing how to write files is important for software developers, especially when working with data storage, configuration files, or generating reports.

1

Create a list of fruits

Create a List<string> called fruits with these exact entries: "Apple", "Banana", "Cherry", "Date", "Elderberry".

C Sharp (C#)

// Create the list of fruits
// Your code here

Need a hint?

Use new List<string> { } to create the list with the fruit names inside curly braces.

2

Set the file path

Create a string variable called filePath and set it to the exact value "fruits.txt".

C Sharp (C#)

using System.Collections.Generic;

List fruits = new List { "Apple", "Banana", "Cherry", "Date", "Elderberry" };

// Set the file path to "fruits.txt"
// Your code here

Need a hint?

Use string filePath = "fruits.txt"; to set the file path.

3

Write the fruits to the file

Use System.IO.File.WriteAllLines with filePath and fruits to write all fruit names to the file.

C Sharp (C#)

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

List fruits = new List { "Apple", "Banana", "Cherry", "Date", "Elderberry" };

string filePath = "fruits.txt";

// Write all fruits to the file
// Your code here

Need a hint?

Use File.WriteAllLines(filePath, fruits); to write the list to the file.

4

Print confirmation message

Write a Console.WriteLine statement to print exactly "Fruits have been saved to fruits.txt".

C Sharp (C#)

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

List fruits = new List { "Apple", "Banana", "Cherry", "Date", "Elderberry" };

string filePath = "fruits.txt";

File.WriteAllLines(filePath, fruits);

// Print confirmation message
// Your code here

Need a hint?

Use Console.WriteLine("Fruits have been saved to fruits.txt"); to show the message.