Today, in this blog let’s play around with one of the interesting and most useful concept in C#.
Introduction
Today, in this article let's play around with one of the interesting and most useful concept in C#.
Question: What are extension methods?
In simple terms "Extension methods are a special kind of static method, but they are called as if they were instance methods on the extended type."
Step 1: Create a new console application
Step 2: The complete code of Arithmetic.cs looks like this
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ExtensionMethodsApp
{
public static class Arithmetic
public static double Add(this double a, double b)
return a + b;
}
public static double Sub(this double a, double b)
return a - b;
public static double Mul(this double a, double b)
return a * b;
public static double Div(this double a, double b)
return a / b;
Step 3: The extension methods showing in intellisense looks like this
Step 4: The complete code of Program.cs looks like this
class Program
static void Main(string[] args)
Console.WriteLine("Addition Result is: " + Arithmetic.Add(2, 2));
Console.WriteLine("Substraction Result is: " + Arithmetic.Sub(2, 1));
Console.WriteLine("Multiplication Result is: " + Arithmetic.Mul(2, 5));
Console.WriteLine("Division Result is: " + Arithmetic.Div(2, 12));
Console.ReadKey(true);
Step 5: The output of the application looks like this
I hope this article is useful for you.