protected override void OnNavigatedTo(NavigationEventArgs e) { insert = new InsertModule(); model.removeAll(); //insert.populateEnglishTables(); model.removeAllPhysicsQuestions(); //insert.pupulatePhysicsTable(); model.removeAllMathsQuestions(); if (comboList.SelectedItem == null) { linkQuit.Visibility = Windows.UI.Xaml.Visibility.Collapsed; lblSelectedGrade.Text = "No Grade Selected"; } if (model.getEnglish() == null) { insert.populateEnglishTables(); } if (model.getMaths() == null) { insert.pupulateMathsTable(); //insert.pupulateMathsTable(); } if (model.getBusiness() == null) { insert.pupulateBusinessTable(); } if (model.getAccounting() == null) { insert.pupulateAccountingTable(); } if (model.getPhysics() == null) { insert.pupulatePhysicsTable(); } comboList.Items.Add("GRADE 8"); comboList.Items.Add("GRADE 10"); comboList.Items.Add("GRADE 12"); base.OnNavigatedFrom(e); }