LFLVRenamer.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace LFLVRenamer
{
    class Program
    {
        private const string DIRECTORY = @"D:\Deluge\LFLV\";
        private static Dictionary<string, int> episodeNo;

        static void Main(string[] args)
        {
            episodeNo = new Dictionary<string, int>();

            GetSeaonDirectories()
                .SelectMany(GetFilesFromSeasonDirectory)
                .ToList()
                .ForEach(Print);
        }

        static IEnumerable<string> GetSeaonDirectories()
        {
            return Directory.GetDirectories(DIRECTORY, "S0*");
        }

        static IEnumerable<string> GetFilesFromSeasonDirectory(string directory)
        {
            return Directory.GetFiles(directory);
        }

        static void Print(string file)
        {
            var directory = file.Substring(0, file.LastIndexOf('\\') + 1);
            if (!episodeNo.ContainsKey(directory))
            {
                episodeNo[directory] = 1;
            }
            var episodename = file.Substring(file.LastIndexOf('\\') + 1 + "LFLV Afsnit XX - ".Length);
            var season = directory.Substring(directory.Length - 3, 2);
            var episodeNoPadded = episodeNo[directory].ToString().PadLeft(2, '0');
            var newFilename = $"{directory}{season}x{episodeNoPadded} - {episodename}";
            Console.WriteLine(file);
            Console.WriteLine(newFilename);
            Console.WriteLine();
            episodeNo[directory]++;
            File.Move(file, newFilename);
        }
    }
}