public MainPresenter(IMainForm view, IFileManager manager, IMessageService service)
{
_view = view;
_manager = manager;
_messageService = service;
_view.setSymbolCount(0);
_view.ContentChanged += new EventHandler(_view_ContentChanged);
_view.FileOpenClick += new EventHandler(_view_FileOpenClick);
_view.FileSaveClick += new EventHandler(_view_FileSaveClick);
}