Naming conventions in C# - Mini Project: Build & Apply

Naming conventions in C#

📖 Scenario: You are creating a simple program to store information about a book in a library system. To keep your code clear and easy to read, you will use proper naming conventions in C#.

🎯 Goal: Learn how to name variables, constants, and methods in C# using the correct naming conventions.

📋 What You'll Learn

Create variables with camelCase naming

Create constants with PascalCase naming

Create a method with PascalCase naming

Use meaningful names following C# conventions

💡 Why This Matters

🌍 Real World

Naming conventions help developers read and understand code quickly, especially in team projects or large codebases.

💼 Career

Following naming conventions is a basic skill expected in software development jobs to write clean, professional code.

1

Create variables with camelCase naming

Create three variables named bookTitle, authorName, and numberOfPages with these exact values: "The Great Gatsby", "F. Scott Fitzgerald", and 180 respectively.

C Sharp (C#)

# Create variables bookTitle, authorName, and numberOfPages with the given values
// Your code here

Hint

Remember, variables in C# use camelCase, starting with a lowercase letter.

2

Create constants with PascalCase naming

Add two constants named MaxBooksAllowed and LibraryName with values 5 and "City Library" respectively. Use the const keyword.

C Sharp (C#)

string bookTitle = "The Great Gatsby";
string authorName = "F. Scott Fitzgerald";
int numberOfPages = 180;
// Add constants MaxBooksAllowed and LibraryName below
// Your code here

Hint

Constants use PascalCase and the const keyword.

3

Create a method with PascalCase naming

Create a method named DisplayBookInfo that takes no parameters and returns void. Inside the method, write code to print the bookTitle and authorName variables using Console.WriteLine.

C Sharp (C#)

string bookTitle = "The Great Gatsby";
string authorName = "F. Scott Fitzgerald";
int numberOfPages = 180;
const int MaxBooksAllowed = 5;
const string LibraryName = "City Library";

// Create method DisplayBookInfo below
// Your code here

Hint

Methods use PascalCase and start with a capital letter.

4

Call the method and display output

Call the DisplayBookInfo method to print the book information.

C Sharp (C#)

string bookTitle = "The Great Gatsby";
string authorName = "F. Scott Fitzgerald";
int numberOfPages = 180;
const int MaxBooksAllowed = 5;
const string LibraryName = "City Library";

void DisplayBookInfo()
{
    Console.WriteLine(bookTitle);
    Console.WriteLine(authorName);
}

// Call DisplayBookInfo method below
// Your code here

Hint

Just write DisplayBookInfo(); to call the method.

Practice

1. Which naming convention is correct for a C# class name?

easy

A. MyClass

B. myClass

C. my_class

D. MYCLASS

Solution

1. Step 1: Understand class naming convention in C#

   Classes in C# use PascalCase, where each word starts with a capital letter and no underscores are used.

2. Step 2: Compare options with PascalCase

   MyClass uses PascalCase correctly. my_class uses snake_case, myClass uses camelCase, and MYCLASS uses all uppercase (incorrect for classes).

3. Final Answer:

   MyClass -> Option A

4. Quick Check:

   Class names use PascalCase = MyClass [OK]

Hint: Classes always start with uppercase letters (PascalCase) [OK]

Common Mistakes:

• Using camelCase for class names
• Using underscores in class names
• Using all uppercase for class names

2. Which of the following is the correct way to name a local variable in C#?

easy

A. localVariable

B. LocalVariable

C. LOCALVARIABLE

D. local_variable

Solution

1. Step 1: Recall local variable naming rules

   Local variables in C# use camelCase, starting with a lowercase letter and no underscores.

2. Step 2: Match options to camelCase

   localVariable uses camelCase correctly. LocalVariable uses PascalCase, LOCALVARIABLE uses all uppercase, and local_variable uses underscores.

3. Final Answer:

   localVariable -> Option A

4. Quick Check:

   Local variables use camelCase = localVariable [OK]

Hint: Local variables start lowercase, no underscores (camelCase) [OK]

Common Mistakes:

• Starting local variables with uppercase letters
• Using underscores in local variable names
• Using all uppercase for local variables

3. What will be the output of the following code snippet?

const int MAX_COUNT = 10;
int maxCount = 5;
Console.WriteLine(MAX_COUNT);
Console.WriteLine(maxCount);

medium

A. Compilation error

B. 10 and 5

C. 5 and 10

D. maxCount and MAX_COUNT

Solution

1. Step 1: Identify constant and variable values

   MAX_COUNT is a constant with value 10, maxCount is a variable with value 5.

2. Step 2: Understand Console.WriteLine outputs

   Console.WriteLine(MAX_COUNT) prints 10, Console.WriteLine(maxCount) prints 5.

3. Final Answer:

   10 and 5 -> Option B

4. Quick Check:

   Constants print their value = 10, variables print their value = 5 [OK]

Hint: Console.WriteLine prints the values, not the names [OK]

Common Mistakes:

• Confusing constant and variable values
• Expecting names to print instead of values
• Thinking naming affects output values

4. Identify the error in the following C# code snippet:

public class exampleClass {
    public int MyProperty { get; set; }
    private int myField;
}

medium

A. Field name should be PascalCase

B. Property name should be camelCase

C. Class name should be PascalCase

D. No errors, code is correct

Solution

1. Step 1: Check class naming convention

   Class names must use PascalCase, but 'exampleClass' starts with lowercase.

2. Step 2: Check property and field naming

   Property 'MyProperty' uses PascalCase correctly; field 'myField' uses camelCase correctly.

3. Final Answer:

   Class name should be PascalCase -> Option C

4. Quick Check:

   Class names = PascalCase, exampleClass is incorrect [OK]

Hint: Class names always start uppercase (PascalCase) [OK]

Common Mistakes:

• Using lowercase for class names
• Confusing property and field naming rules
• Thinking camelCase is okay for classes

5. You have a constant for the maximum number of users and a method parameter for the current user count. Which naming is correct in C#?

public const int max_users = 100;
public void UpdateUserCount(int CurrentUserCount) { }

hard

A. MaxUsers and currentusercount

B. maxUsers and CurrentUserCount

C. max_users and current_user_count

D. MaxUsers and currentUserCount

Solution

1. Step 1: Naming for constants

   Constants use PascalCase, so MaxUsers is correct, max_users is incorrect.

2. Step 2: Naming for method parameters

   Method parameters use camelCase, so currentUserCount is correct, CurrentUserCount is incorrect.

3. Final Answer:

   MaxUsers and currentUserCount -> Option D

4. Quick Check:

   Constants PascalCase, parameters camelCase = MaxUsers, currentUserCount [OK]

Hint: Constants PascalCase, parameters camelCase (start lowercase) [OK]

Common Mistakes:

• Using camelCase for constants
• Starting parameters with uppercase letters
• Using underscores in parameters