Program that emulates a Calculator ^^

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

namespace Calculation
{
    class CalculateNumber
    {
        int Number1, Number 2;
        char option;
        int Result;

        public void Number ()
        {
            Console.WriteLine("Enter the First Number");
            Number1 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Enter the Second nummber");
            Number2 = Convert.ToInt32(Console.ReadLine());

            Console.WriteLine("Main Menu");
            Console.WriteLine("1.Addition");
            Console.WriteLine("2.Subtraction");
            Console.WriteLine("3.Multiplication");
            Console.WriteLine("4.Division");

            Console.WriteLine("Enter the Operation you want to perform");
            option = Convert.ToChar(Console.ReadLine());

            switch (option)
            {
                case '1':
                    Result = Number1 + Number2;
                    Console.WriteLine("The result of addition is: {0}", Result);
                break;

                case '2':

                    Result = Number1 - Number2;
                    Console.WriteLine("The result of subtraction is: {0}", Result);
                break;

                case '3':
               
                    Result = Number1 * Number2;
                    Console.WriteLine("The result of multiplication is: {0}", Result);
                break;

                case '4':
               
                    Result = Number1 / Number2;
                    Console.WriteLine("The result of division is: {0}", Result);
                break;
                default:
                    Console.WriteLine("Invailid Option");
                break;
            }
           
            Console.ReadLine();

        }
    }
    class ClassMain
    {
        static void Main (string[] args)
        {
            CalculateNumber obj = new CalculateNumber();
            obj.Number();
        }
    }
}