A ReadLine extension for FileStream objects

FileStreamReadLineExtension.cs

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

public static class FileStreamReadLineExtension
{
    public static string ReadLine(this FileStream fs)
    {
        int curChar;
        // EOF - return null
        if ((curChar = fs.ReadByte()) == -1)
            return null;

        // Return a string
        List<char> chars = new List<char>();
        do
        {
            // End of Line
            if (curChar == '\n' || curChar == '\r')
                break;
            chars.Add((char)curChar);
        }
        while ((curChar = fs.ReadByte()) != -1);

        // Make sure we also skip past any \r\n
        if (curChar == '\r' && fs.ReadByte() != '\n')
            fs.Seek(-1, SeekOrigin.Current);

        // Everything we read this line
        return new string(chars.ToArray());
    }
}