using System;  

public class ArrayExample  

{  

    //tao mot ham tu dinh nghia nhan hai tham so

        public static int Sum(int num1, int num2)

        {

            int total;

            total = num1 + num2;

            return total;

        }

    public static void Main(string[] args)  

    {

            Console.Write("\nTao ham tu dinh nghia de tinh tong hai so trong C#:\n");

            Console.Write("--------------------------------------------------\n");

            Console.Write("Nhap so hang thu nhat: ");

            int n1 = Convert.ToInt32(Console.ReadLine());

            Console.Write("Nhap so hang thu hai: ");

            int n2 = Convert.ToInt32(Console.ReadLine());

            //goi ham tu dinh nghia

            Console.WriteLine("\nTong hai so: {0} \n", Sum(n1, n2));

    }

}