LINQ method syntax in C Sharp (C#) - Mini Project: Build & Apply

Filter and Select with LINQ Method Syntax

📖 Scenario: You work in a bookstore and have a list of books with their prices. You want to find all books that cost less than $20 and get their titles.

🎯 Goal: Build a C# program that uses LINQ method syntax to filter books priced below $20 and select their titles.

📋 What You'll Learn

Create a list of books with exact titles and prices

Create a price limit variable

Use LINQ method syntax with Where and Select to filter and select book titles

Print the filtered book titles

💡 Why This Matters

🌍 Real World

Filtering and selecting data from collections is common in apps like online stores, libraries, and inventory systems.

💼 Career

Knowing LINQ method syntax helps you write clear and efficient queries in C# for data processing tasks.

1

Create the list of books

Create a list of tuples called books with these exact entries: ("C# Basics", 15.99), ("LINQ in Action", 25.50), ("ASP.NET Core", 18.75), ("Entity Framework", 22.30), ("Clean Code", 19.99).

C Sharp (C#)

// Create the list of books with titles and prices
// Your code here

Need a hint?

Use new List<(string Title, double Price)> { ... } to create the list.

2

Set the price limit

Create a double variable called priceLimit and set it to 20.0.

C Sharp (C#)

var books = new List
{
    ("C# Basics", 15.99),
    ("LINQ in Action", 25.50),
    ("ASP.NET Core", 18.75),
    ("Entity Framework", 22.30),
    ("Clean Code", 19.99)
};

// Create the price limit variable
// Your code here

Need a hint?

Use double priceLimit = 20.0; to set the limit.

3

Filter and select book titles using LINQ method syntax

Create a variable called affordableBooks that uses LINQ method syntax on books to filter books where Price < priceLimit using Where, then select only the Title using Select.

C Sharp (C#)

var books = new List
{
    ("C# Basics", 15.99),
    ("LINQ in Action", 25.50),
    ("ASP.NET Core", 18.75),
    ("Entity Framework", 22.30),
    ("Clean Code", 19.99)
};

double priceLimit = 20.0;

// Use LINQ method syntax to filter and select titles
// Your code here

Need a hint?

Chain Where and Select methods with lambda expressions.

4

Print the filtered book titles

Use a foreach loop to print each title in affordableBooks on its own line.

C Sharp (C#)

var books = new List
{
    ("C# Basics", 15.99),
    ("LINQ in Action", 25.50),
    ("ASP.NET Core", 18.75),
    ("Entity Framework", 22.30),
    ("Clean Code", 19.99)
};

double priceLimit = 20.0;

var affordableBooks = books.Where(book => book.Price  book.Title);

// Print each title in affordableBooks
// Your code here

Need a hint?

Use foreach (var title in affordableBooks) { Console.WriteLine(title); } to print.