public void SetDeskID(string value)
{
    var encoding = DeskIDResolvedCharacterEncoding;
    const int sizeOfLengthField = 1;
    int limit = _parentMessage.Limit;
    int byteCount = _buffer.SetBytesFromString(encoding, value, limit + sizeOfLengthField);
    _parentMessage.Limit = limit + sizeOfLengthField + byteCount;
    _buffer.Uint8Put(limit, (ushort)byteCount);
}

public unsafe void Uint8Put(int index, byte value)
{
    _pBuffer[index] = value;
}