Preview:
using System;

namespace ConsoleApp1
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("First Number: ");
            string userNum1 = Console.ReadLine();
            Console.WriteLine("Second Number: ");
            string userNum2 = Console.ReadLine();
            Console.WriteLine("The total is: "+Sum(userNum1, userNum2));
            Console.Read();
        }

        public static string Sum(string stringNum1, string stringNum2) {
            //Parsing string to int
            int intNum1 = Int32.Parse(stringNum1);
            int intNum2 = Int32.Parse(stringNum2);

            //Sum 2 numbers
            int sum = intNum1 + intNum2;

            //Returning sum by converitn to string
            return sum.ToString();
        }
    }
}
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