How to generate the Fabonacci Series in C#.Net

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int a = -1;

            int b = 1;

            int x;

            Console.WriteLine("Enter the x value =");

            x = int.Parse(Console.ReadLine());

            for (int i = 0; i < x; i++)

            {

                int sum = b + a;

                a = b;

                b = sum;

                Console.WriteLine(sum);

            }

            Console.ReadLine();

        }

    }

}