public Feedback() { InitializeComponent(); List <string> opinion = new List <string>(); try { if (feedbackclass.CheckForFeedback()) { feedbackComboBox.Visibility = Visibility.Hidden; submitButton.Visibility = Visibility.Hidden; opinionTextBlock.Content = "Thank You For Your Feedback"; } else { opinion.Add("Happy"); opinion.Add("Unhappy"); foreach (string str in opinion) { feedbackComboBox.Items.Add(str); } } } catch (Exception exe) { ModernDialog.ShowMessage("Please Try Again Later Thank You", "Error", MessageBoxButton.OK, null); } }