Regex rgx = new Regex("123456$");
	int counter = 0;
	int counter2 = 0;
	using (StreamReader sr = new StreamReader(@"10-million-combos.txt"))
	{
		String line;
		while ((line = sr.ReadLine()) != null)
		{
			++counter;
			if (rgx.IsMatch(line))
			{
				++counter2;
			}
		}
	}