C# Fibonacci Number Sequence

.cs

//@Euler29 on GitHub
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Fibonacci
    {
        static void Main(string[] args)
        {
            double a = 1;
            double b = 1;
            double c;
            Console.WriteLine("1");
            Console.WriteLine("1");
            for (int i=1;i<=9999;i++)
            {
                c = b;
                b = b + a;
                Console.WriteLine(b.ToString());
                a = c;
            }
            Console.ReadKey();
        }
    }
}