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public static void Main() 
    {
      string path = @"c:\temp\Test.txt";
      String zeile = "";

      try 
      {
        if (File.Exists(path)) 
        {
          File.Delete(path);
        }

        using (StreamWriter sw = new StreamWriter(path)) 
        {
          sw.WriteLine("Zeile 1");
          sw.WriteLine("Zeile 2");
          sw.WriteLine("Zeile 3");
          sw.WriteLine("Zeile 4");
        }

        using (StreamReader sr = new StreamReader(path)) 
        {

          while (sr.Peek() >= 0) 
          {
            zeile = sr.ReadLine();
            
          }
        }
      } 
      catch (Exception e) 
      {
        Console.WriteLine("Fehler: {0}", e.ToString());
      }

      Console.WriteLine(zeile);
    }