Simple Calculator Programe in C#.Net

using System;

namespace Calculator
{
  class CalculateNumber
   {
     static void Main(string[] args)
    {
      int number1, number2;
      char option, quit;
      int result;
      Console.WriteLine("Enter the first number");
      number1 = Convert.ToInt32(Console.ReadLine());
      Console.WriteLine("Enter the second number");
      number2 = Convert.ToInt32(Console.ReadLine());
      Console.WriteLine("MAIN MENU");
      Console.WriteLine("1. Addition");
      Console.WriteLine("2. Substraction");
      Console.WriteLine("3. Multiplication");
      Console.WriteLine("4. Division");
      Console.WriteLine("Enter the operation ypu want to program");
      option = Convert.ToChar(Console.ReadLine());
      quit = 'y';
      while (quit == 'y' || quit == 'Y')
       {
         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 substraction 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("Invalid option");
         break;
        }
         Console.Write("Do You want to continue (Y or N) :");
         quit = Convert.ToChar(Console.ReadLine());
      }
   }
}