Reading a Flat File without loading the result list into memory.

private static IEnumerable<string[]> GetLineText(string FilePath)
{
    using (StreamReader rdr = new StreamReader(FilePath))
    {
        string line;
        while ((line = rdr.ReadLine()) != null)
        {
            // in this case data in flat file are separated by pipe("|").
            yield return line.Split('|');
        }
    }
}