private void AddFolder(object obj) { bool isAlreadyListed = _blackListedDirectories.Any(f => f.Name == _newFolder); if (!isAlreadyListed) { if (!string.IsNullOrEmpty(_newFolder)) { var blackFolder = new BlackListedDirectory { Name = _newFolder }; _databaseService.AddBlacklistedDirectory(blackFolder); BlackListedDirectories = _databaseService.GetBlackListedDirectories(); NewFolder = string.Empty; } } }