Swap range sum

using System;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {   // the range [x,y] closed
            int x = Convert.ToInt32(Console.ReadLine());
            int y = Convert.ToInt32(Console.ReadLine());
            int sum =0; // will carry the sum :3 declared out side loop scoop with value = 0
            int temp;
            //swap
            if (x > y) {
                temp = x;
                x = y;
                y = temp;

            }


            while (x <= y) { //removed 5 we 7atet y as max range
               //simple sum
                sum += x;
                // the increment to make the loop end
                x++;
            }
            //the answer out side the loop
            Console.WriteLine("the sum is : {0}", sum);

        }
    }
}