Garbage Management wpf

public class Service
{
    #region Fields
    protected TaskCompletionSource<DialogResult>? _dialogtcs;
    protected ModalNavigationStore _modalNavigationStore;

    #region Constructors
    public Service(ModalNavigationStore modalNavigationStore)
    {
        _modalNavigationStore = modalNavigationStore;
        _parameterNavigationService = navigationService;
    }
    #endregion
}