FileReaderHelper - ReadEndFile

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace LogViewer.Helpers
{
    public class FileReaderHelper
    {
        public static List<string> ReadEndFile(string fileName, long startingOffset, out long endingOffset)
        {
            List<string> resultList = new List<string>();

            long read_size = 1024 * 5; //500K

            using (var fstream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                if (startingOffset == fstream.Length)
                {
                    //no changes
                    endingOffset = startingOffset;
                    return resultList;
                }
                else if (startingOffset > fstream.Length)
                    startingOffset = fstream.Length - read_size;
                else if (startingOffset == 0)
                {
                    if (fstream.Length > read_size)
                        startingOffset = fstream.Length - read_size;
                }

                //seek to near end of file
                fstream.Seek(startingOffset, SeekOrigin.Begin);

                //read last part of file
                byte[] buffer = new byte[read_size];
                int read = fstream.Read(buffer, 0, buffer.Length);

                string data = null;
                if (read > 0)
                    data = Encoding.ASCII.GetString(buffer);

                endingOffset = fstream.Length;

                string[] lines = data.Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
                foreach (string line in lines)
                {
                    if (String.IsNullOrWhiteSpace(line))
                        continue;
                     resultList.Add(line);
                }
            }
            return resultList;
        }
    }
}