using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var filecontent = "\\t\nSource\tArtikelGruppenID\tArtikelID\tArtikelName\nmumu";

        var firstline1 = filecontent.Split(new [] { '\r', '\n' }).FirstOrDefault();

        Console.WriteLine(firstline1);

        //check if escaped

        //should be one of those bad boys https://msdn.microsoft.com/en-us/library/h21280bw.aspx

        var delimiter = System.Text.RegularExpressions.Regex.Unescape(firstline1);

        Console.WriteLine(delimiter);

        //parse lines with defined separator

        var lines = filecontent.Split(new [] { '\r', '\n' }).ToList();

        bool skipFirst = true;

        foreach(var line in lines)

        {

            Console.WriteLine("Line:");

            Console.WriteLine(line);

            Console.WriteLine("Words:");

            //do somethig nicer here to skip first line

            if (skipFirst){ skipFirst = false; continue;}

            var splitedLine = line.Split(new string[] { delimiter }, StringSplitOptions.None);

            foreach(var word in splitedLine)

            {

                Console.WriteLine(word);

            }

            Console.WriteLine("");

        }

    }

}