private string DefineDifficultString(DifficultyMode difficultyMode) { string str = null; switch (difficultyMode) { case DifficultyMode.Easy: str = StringService.GetRandomString(3, _mainWindow.IsCaseSensitive); break; case DifficultyMode.Normal: str = StringService.GetRandomString(4, _mainWindow.IsCaseSensitive); break; case DifficultyMode.Hard: str = StringService.GetRandomString(5, _mainWindow.IsCaseSensitive); break; case DifficultyMode.Professional: str = StringService.GetRandomString(6, _mainWindow.IsCaseSensitive); break; case DifficultyMode.Expert: str = StringService.GetRandomString(7, _mainWindow.IsCaseSensitive); break; } return(str); }