In C#, a class is a blueprint for creating objects. It defines properties, methods, and events that represent the characteristics and behaviors of an object.

Video Explanation​

Watch

1. What is a Class?​

A class in C# defines the structure and behavior of objects. It includes fields, properties, methods, and constructors.

Example:​

public class Car {
    public string color = "red";
    public void Drive() {
        Console.WriteLine("The car is driving.");
    }
}

This example defines a class Car with a property color and a method Drive.

2. Defining a Class​

In C#, classes are defined using the class keyword.

Syntax:​

public class ClassName {
    // fields, properties, methods, and constructors
}

Example:​

public class Person {
    public string Name;
    public int Age;
}

3. Fields in Classes​

Fields are variables that hold data related to an object. They are typically private but can be public as well.

Example:​

public class Person {
    public string Name; // Field
}

4. Properties​

Properties provide controlled access to fields and use get and set accessors.

Example:​

public class Person {
    private string name;

    public string Name {
        get { return name; }
        set { name = value; }
    }
}

5. Methods in Classes​

Methods define actions that an object can perform.

Example:​

public class Car {
    public void Drive() {
        Console.WriteLine("The car is driving.");
    }
}

6. Constructors​

Constructors initialize an object when it is created.

Example:​

public class Person {
    public string Name;

    public Person(string name) {
        Name = name; // Constructor initializes the Name property
    }
}

7. Access Modifiers​

Access modifiers control the visibility of class members (public, private, protected).

Example:​

public class Car {
    private string color; // Private member
    public void SetColor(string c) {
        color = c; // Public method to set color
    }
}

8. Static Classes and Members​

Static classes cannot be instantiated, and static members belong to the class itself rather than an instance.

Example:​

public static class Utility {
    public static void PrintMessage(string message) {
        Console.WriteLine(message);
    }
}

Summary​

Classes are essential for object-oriented programming in C#. They provide a way to organize data and behaviors in your programs, making them more modular and maintainable.

Happy coding!