public BrowseFolderDialog()
 {
     _dialogMessage = "フォルダを選択してください:";
     _directoryPath = String.Empty;
     _startLocation = SH.CSIDL.DESKTOP;
     _options = SH.BIF.RETURNONLYFSDIRS  | SH.BIF.DONTGOBELOWDOMAIN | SH.BIF.NEWDIALOGSTYLE ;
     _procedure = BffCallback;
     _lParam = 0;
 }
 public void SetOptionField(Win32.SH.BIF mask, bool turnOn)
 {
     if (turnOn)
         _options |= mask;
     else
         _options &= ~mask;
 }