C# - Call a Method

How to Call a Method in C#

An instance method is one that belongs to an instance of the class, so you first need to create an object of the class before calling the method.

using System;

class Car
{
    // Instance method
    public void StartEngine()
    {
        Console.WriteLine("Engine started!");
    }

    public void Drive(string destination)
    {
        Console.WriteLine($"Driving to {destination}");
    }
}

class Program
{
    static void Main()
    {
        // Creating an instance of the Car class
        Car myCar = new Car();

        // Calling instance methods using the instance
        myCar.StartEngine();   // Output: Engine started!
        myCar.Drive("New York"); // Output: Driving to New York
    }
}

Explanation:

• We first create an object of the Car class using Car myCar = new Car();.
• Then, we call the StartEngine and Drive methods using the object myCar.

2. Calling a Static Method

A static method belongs to the class itself, not an instance. You can call a static method directly using the class name without creating an object of the class.

using System;

class MathOperations
{
    // Static method
    public static int Add(int a, int b)
    {
        return a + b;
    }

    public static void DisplayMessage()
    {
        Console.WriteLine("This is a static method!");
    }
}

class Program
{
    static void Main()
    {
        // Calling static methods using the class name
        int result = MathOperations.Add(5, 3);   // Output: 8
        Console.WriteLine($"The sum is: {result}");

        MathOperations.DisplayMessage(); // Output: This is a static method!
    }
}

Explanation:

• Static methods are called using the class name, like MathOperations.Add(5, 3).
• No object creation is needed for static methods

3 . Calling a Method from Another Class Instance

You can also call a method from one class inside another class. Here’s an example where one class calls a method from another class.

using System;

class Car
{
    public void StartEngine()
    {
        Console.WriteLine("Car engine started!");
    }
}

class Driver
{
    public void DriveCar(Car car)
    {
        // Calling method from Car class
        car.StartEngine();  // Output: Car engine started!
        Console.WriteLine("Driver is driving the car.");
    }
}

class Program
{
    static void Main()
    {
        Car myCar = new Car();
        Driver driver = new Driver();
        
        driver.DriveCar(myCar);  // The Driver calls the Car's method
    }
}

Explanation:

The Driver class has a method DriveCar that accepts an object of the Car class and calls the StartEngine method of the Car class using car.StartEngine().