NumberSequence v1

using System;

class NumberSequence
{
    static void Main()
    {
        int positiveMember = 0;
        int negativeMember = -1;

        for (int i = 0; i <= 3; i++)
        {
            Console.Write((positiveMember += 2) + ", ");
            Console.Write((negativeMember -= 2) + ", ");
        }

        Console.Write((positiveMember += 2) + ", ");
        Console.WriteLine(negativeMember -= 2);
    }
}