C# how to create a simple calculator based on user input

We've seen all those tutorials about calculators n all which show how to add and stuff, example;

int x = 4;
int y = 5;
int result = x + y;
Console.WriteLine("Total Sum is : {0}", result);  

Now above code is like really basic and to be honest kinda stupid cuz common who really embeds their sum in a program, what you want is that the user enters what two numbers he/she wanna add/multiply and then the result is displayed on the console. Thats cool innit ?

So fireup your visual studio create a new console application, if you dunno how to read,
How to create new console app. in C#.

1. Ask for user input whether he/she wants to add or multiply, and store input in "choice

Console.Write("Enter 1 for addition, 2 for multiplication: ");
int choice = int.Parse(Console.ReadLine()); 

2. Now make a new class called SimpleCalculator which will hold our add and multiply methods.

class SimpleCalculator{

}

3. Now lets make two methods for add and multiply

 public int add(int x, int y)
        {
            Console.Write("\nThe addition is ");
            return x + y;

        }

  public int mul(int x, int y)
        {
            Console.Write("\nThe multiplication is ");
            return x * y;

        }

4. Full code for main method:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {



            Console.Write("Enter 1 for addition, 2 for multiplication: ");
            int choice = int.Parse(Console.ReadLine());


            if (choice == 1)
            {
                //addition
                Console.WriteLine("Welcome to Addition...");
                Console.WriteLine("\nEnter first number: ");
                int num1 = int.Parse(Console.ReadLine());
                Console.WriteLine("\nEnter second number: ");
                int num2 = int.Parse(Console.ReadLine());
                SimpleCalculator AddCalc = new SimpleCalculator();
                Console.WriteLine(AddCalc.add(num1, num2));

            }
            else if (choice == 2)
            {
                Console.WriteLine("Welcome to Multiplication...");
                Console.WriteLine("\nEnter first number: ");
                int num1 = int.Parse(Console.ReadLine());
                Console.WriteLine("\nEnter second number: ");
                int num2 = int.Parse(Console.ReadLine());
                SimpleCalculator Mul = new SimpleCalculator();
                Console.WriteLine(Mul.mul(num1, num2));
            }





            Console.ReadLine();

        }
    }
}

5. Full code for SimpleCalculator class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class SimpleCalculator
    {

        public int add(int x, int y)
        {
            Console.Write("\nThe addition is ");
            return x + y;

        }


        public int mul(int x, int y)
        {
            Console.Write("\nThe multiplication is ");
            return x * y;

        }
    }
}