List generic collection in C Sharp (C#) - Mini Project: Build & Apply

Working with List Generic Collection in C#

📖 Scenario: You are building a simple contact list application to store names of friends. You will use a List<string> to keep track of the names.

🎯 Goal: Create and manage a List<string> to add, check, and display friend names.

📋 What You'll Learn

Create a List of strings called friends with initial names

Add a new friend name to the list

Check if a specific friend name exists in the list

Display the total number of friends in the list

💡 Why This Matters

🌍 Real World

Lists are used in many applications to store collections of items like contacts, tasks, or products.

💼 Career

Understanding List collections is essential for software development jobs that involve data management and user data handling.

1

Create the initial List of friends

Create a List<string> called friends and initialize it with these exact names: "Alice", "Bob", "Charlie".

C Sharp (C#)

// Create the List called friends with initial names
// Your code here

Need a hint?

Use the List<string> constructor with curly braces to add initial names.

2

Add a new friend to the list

Add the friend name "Diana" to the existing friends list using the Add method.

C Sharp (C#)

using System.Collections.Generic;

List friends = new List { "Alice", "Bob", "Charlie" };
// Add "Diana" to the friends list
// Your code here

Need a hint?

Use friends.Add("Diana") to add the new name.

3

Check if a friend exists in the list

Create a boolean variable called hasBob that checks if the name "Bob" exists in the friends list using the Contains method.

C Sharp (C#)

using System.Collections.Generic;

List friends = new List { "Alice", "Bob", "Charlie" };
friends.Add("Diana");
// Check if "Bob" is in the friends list and store result in hasBob
// Your code here

Need a hint?

Use bool hasBob = friends.Contains("Bob") to check presence.

4

Get the total number of friends

Create an integer variable called totalFriends and set it to the number of items in the friends list using the Count property.

C Sharp (C#)

using System.Collections.Generic;

List friends = new List { "Alice", "Bob", "Charlie" };
friends.Add("Diana");
bool hasBob = friends.Contains("Bob");
// Create totalFriends to hold the count of friends
// Your code here

Need a hint?

Use friends.Count to get the number of items.