Introduction I would like to share how to create Extension methods in C# and why we need to have them in C#. First we will discuss the problem and then will rectify the problem using an Extension method. Understanding the problem 1. Add a Class library as per the following screen. We created a Calculator library. 2. Add the calculator class as per the screen below. Code public class Calculator { public int Add( int x, int y) { return x + y; } public int Subtract( int x, int y) { return x - y; } public int Divide( int x, int y) { ...