BulkPrintingAPI/MAXClient/MessageBuild...

using System;
using System.Text;

namespace MAX
{
    public class MessageBuilder
    {
        private StringBuilder _builder;

        public MessageBuilder()
        {
            _builder = new StringBuilder(1024);
            _builder.Append("\0\0");
        }

        public MessageBuilder Append<T>(T value)
        {
            _builder.Append(value);
            return this;
        }

        public byte[] GetBytes()
        {
            int length = _builder.Length - 2;
            if (length <= 0)
                throw new Exception("Message is too short");
            else if (length > 65535)
                throw new Exception("Message is too long");
            _builder[0] = (char)(length / 256);
            _builder[1] = (char)(length % 256);
            return Encoding.ASCII.GetBytes(_builder.ToString());
        }
    }
}