using System;
namespace t1000{
    class Program{
        public static void Main(string[] args){
            string[] s = Console.ReadLine().Split(' ');
            Console.WriteLine(int.Parse(s[0]) + int.Parse(s[1]));
        }
    }
}

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

namespace ConsoleApp1
{

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

            int a, b;
            a=Convert.ToInt32(Console.ReadLine());
            b = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine(a + b);

        }
    }
}
Why my method is incorrect?