public void DeleteCategorie()
        {
            MessageBoxResult result = MessageBox.Show("When you delete a Category, all Algorithms from this Category will be removed too." + "\n" + "By removing a Algorithm, all Results from this Algorithm will be deleted too." + "\n" + " Are you sure you want to delete this Category ?",
                                                      "Delete Category?", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);

            switch (result)
            {
            case MessageBoxResult.Yes:
                CategorieDataService cds = new CategorieDataService();
                cds.DeleteCategorie(SelectedCategorie);
                Messenger.Default.Send <UpdateFinishedMessage>(new UpdateFinishedMessage(UpdateFinishedMessage.MessageType.Deleted));
                break;
            }
        }