public FormListViewModel() { Title = "Forms"; Forms = new ObservableCollection <Form>(); LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand()); MessagingCenter.Subscribe <NewFormPage, Form>(this, "AddForm", async(obj, form) => { var newForm = form as Form; Forms.Add(newForm); await DataStore.AddFormAsync(newForm); }); MessagingCenter.Subscribe <ChartPage, Form>(this, "RemoveForm", async(obj, form) => { var newForm = form as Form; Forms.Remove(newForm); await DataStore.DeleteFormAsync(newForm.Id); }); MessagingCenter.Subscribe <DataEntryPage, Entry>(this, "AddEntry", async(obj, entry) => { var newEntry = entry as Entry; Form form = await DataStore.GetFormAsync(newEntry.FormID); form.XFormValues.Add(entry.Val1); form.YFormValues.Add(entry.Val2); form.EntryCount++; form.EntryCountString = form.EntryCount.ToString() + " entries"; if (form.EntryCount == 1) { form.EntryCountString = form.EntryCount.ToString() + " entry"; } else { form.EntryCountString = form.EntryCount.ToString() + " entries"; } await DataStore.UpdateFormAsync(form); // Forms.Add(newForm); // await DataStore.AddFormAsync(newForm); }); }