Program Calculator

using System;
namespace Calculation
{
class CalculateNumber
{
float Number1, Number2;
char option;
float Result;
   
public void Number()
{
  
Console.WriteLine("Masukkan Angka Pertama");
Number1 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Masukkan Angka Kedua");
Number2 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Pilihan");
Console.WriteLine("1.Penjumlahan");
Console.WriteLine("2.Pengurangan");
Console.WriteLine("3.Perkalian");
Console.WriteLine("4.Pembagian");
Console.WriteLine("Masukkan Option Pilihan anda");
option = Convert.ToChar(Console.ReadLine());
switch (option)
{
    case '1':
Result = Number1 + Number2;
Console.WriteLine("Hasil Penjumlahan adalah: {0}", Result);
break;
case '2':
Result = Number1 - Number2;
Console.WriteLine("Hasil Pengurangan adalah: {0}", Result);
break;
case '3':
Result = Number1 * Number2;
Console.WriteLine("Hasil Perkalian adalah: {0}", Result);
break;
case '4':
Result = Number1 / Number2;
Console.WriteLine("Hasil Pembagian adalah: {0}", Result);
break;
default:
Console.WriteLine("Invalid Option");
break;
}
Console.ReadLine();
}
}
class ClassMain
{
static void Main(string[] args)
{
CalculateNumber obj = new CalculateNumber();
obj.Number();
}
}
}