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;
}