convert string to int and double

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

namespace ConsoleApp7
{
    class Program
    {
        static void Main(string[] args)
        {
            string num1 = "15";
            string num2 = "20";
            int sum = int.Parse(num1) + int.Parse(num2);

            double sumD = double.Parse(num1) + double.Parse(num2);
            Console.WriteLine(sum);
            Console.WriteLine(sumD);
            Console.Read();
        }
    }
}