Print and Sum

using System;

namespace Unknown
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please enter first number ");
            int firstNum = int.Parse(Console.ReadLine());
            Console.WriteLine("Please enter second number ");
            int secondNum = int.Parse(Console.ReadLine());
            int sum = 0;
            for (int i = firstNum; i <= secondNum; i++)
            {
                sum += i;
                Console.Write(i + " ");
            }
            Console.WriteLine();
            Console.WriteLine("Sum: " + sum);
        }

    }
}