outReference.cs

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

 class Program
 {
    static void addNumbers(int a, int b, out int i)
    {
        i = a + b;
    }
    static void Main()
    {
        int value;
        addNumbers(23, 25, out value);

        Console.WriteLine(value);
    }

}