Question

foreach (var line in File.ReadLines("Filename"))
{
    // ...process line.
}

 private static String[] InternalReadAllLines(String path, Encoding encoding)
    {
        String line;
        List<String> lines = new List<String>();

        using (StreamReader sr = new StreamReader(path, encoding))
            while ((line = sr.ReadLine()) != null)
                lines.Add(line);

        return lines.ToArray();
    }