private void UpdateOSVersionList() { OSVersion.SelectedIndex = -1; OSVersion.Items.Clear(); IList <RegistryLocations> registryLocations = ConfigParser.GetDefaultRegistryLocations(); if (File.Exists(locations.OSFileLocation)) { string json = File.ReadAllText(locations.OSFileLocation); try { registryLocations = JsonConvert.DeserializeObject <IList <RegistryLocations> >(json); } catch (JsonSerializationException) { showErrorMessage("The OS file selected is not formatted properly. Will proceed with default OS configurations.", "Incorrect OS Configuration File Format"); } } foreach (RegistryLocations location in registryLocations) { if (!OSVersion.Items.Contains(location.OperatingSystem)) { OSVersion.Items.Add(location.OperatingSystem); } } }