What does a class in C# typically contain?

A class in C# typically contains fields, properties, methods, and constructors to define object structure and behavior.

How Do You Create a Class in C#? | FullStackPrep.Dev

Q: How do you create a class in C#?

You define a class in C# using the 'class' keyword followed by the class name and its members inside curly braces.

💡 Concept: Creating a Class in C#

In C#, a class is a blueprint for creating objects. It encapsulates data for the object and methods to manipulate that data. A class defines types, behavior, and structure that instances (objects) of that class will share.

📘 Quick Intro

Creating a class in C# involves using the class keyword followed by the class name. A class can contain fields, properties, methods, constructors, and other members. It serves as the foundation for object-oriented programming in C#.

🧠 Analogy

Think of a class as a cookie cutter and the objects as cookies made from it. The cutter defines the shape (structure and behavior), while each cookie is an instance with its own unique values.

🔧 Technical Explanation

✅ Use the class keyword followed by the name.
✅ A class can include fields, constructors, methods, and properties.
✅ By default, class members are private unless specified otherwise.
✅ Classes support inheritance and polymorphism.
✅ C# also supports static classes which cannot be instantiated.

🎯 Use Cases

📦 Encapsulate business logic for objects such as Customer, Order, etc.
🛠 Organize code in an object-oriented manner.
🚀 Provide reusable components with methods and properties.
🔁 Support inheritance and polymorphism for extendable systems.

💻 Code Example

// Creating a basic class
public class Car {
    public string Make;
    public string Model;

    public void Drive() {
        Console.WriteLine(""Driving the car..."");
    }
}

// Using the class
Car myCar = new Car();
myCar.Make = ""Toyota"";
myCar.Model = ""Camry"";
myCar.Drive();

❓ Interview Q&A

Q1: How do you declare a class in C#?
A: Using the class keyword followed by the class name.

Q2: What can a class contain?
A: Fields, properties, methods, constructors, and events.

Q3: What is the default access modifier of class members?
A: Private.

Q4: Can a class be static in C#?
A: Yes, but it cannot be instantiated.

Q5: Can classes inherit from other classes?
A: Yes, C# supports single inheritance.

Q6: How do you create an object from a class?
A: Using the new keyword.

Q7: What is encapsulation in the context of a class?
A: Hiding data using access modifiers and exposing it via properties.

Q8: Can a class contain other classes?
A: Yes, nested classes are allowed.

Q9: What is the difference between class and object?
A: A class is a blueprint; an object is an instance of the class.

Q10: Can we overload methods in a class?
A: Yes, method overloading is supported.

📝 MCQs

Q1. What keyword is used to define a class in C#?

struct
define
class
object

Q2. Which members can a class contain?

Fields
Methods
Properties
All of the above

Q3. What is the default access modifier of a class member?

Public
Protected
Private
Internal

Q4. Can a class be abstract?

No
Yes
Only static
Only sealed

Q5. What is instantiation?

Defining class
Importing class
Deleting class
Creating an object from a class

Q6. Which keyword is used to create an object?

make
this
new
instanceof

Q7. Can a class contain static members?

No
Yes
Only methods
Only constants

Q8. Which of the following is not part of a class?

Constructor
Method
Namespace
Property

Q9. What is a constructor used for?

Delete class
Initialize object
Compile code
None

Q10. What is true about a class?

It's a variable
It's a method
It is a blueprint for objects
None

💡 Bonus Insight

Good class design follows the SOLID principles. Keep class responsibilities narrow, use access modifiers wisely, and rely on composition over inheritance wherever possible.

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How Do You Create a Class in C#?