public MainPage() { SQLiteGeneral sqlDb = new SQLiteGeneral(DependencyService.Get <ISQLiteDb>(), ""); PageService pageService = new PageService(); mainModel = new DashboardViewModel(sqlDb, pageService); InitializeComponent(); init.InitializeCategories(); dpkFrom.SetValue(DatePicker.MinimumDateProperty, DateTime.Today.AddMonths(-12)); dpkFrom.SetValue(DatePicker.MaximumDateProperty, DateTime.Today); dpkTo.SetValue(DatePicker.MinimumDateProperty, DateTime.Today.AddMonths(-12)); dpkTo.SetValue(DatePicker.MaximumDateProperty, DateTime.Today); mainModel.FromDate = DateTime.Today.AddDays(-30); mainModel.ToDate = DateTime.Today; }