Assign more than 256 character in string

private static string ReadLine() { Stream inputStream = Console.OpenStandardInput(READLINE_BUFFER_SIZE); byte[] bytes = new byte[READLINE_BUFFER_SIZE]; int outputLength = inputStream.Read(bytes, 0, READLINE_BUFFER_SIZE); //Console.WriteLine(outputLength); char[] chars = Encoding.UTF7.GetChars(bytes, 0, outputLength); return new string(chars); }