private async void InsertTodoItem(TodoItem todoItem)
 {
     // This code inserts a new TodoItem into the database. When the operation completes
     // and Mobile Services has assigned an Id, the item is added to the CollectionView
     await todoTable.InsertAsync(todoItem);
     items.Add(todoItem);                        
 }
        private void ButtonSave_Click(object sender, RoutedEventArgs e)
        {
            var todoItem = new TodoItem { Text = TextInput.Text };

            InsertTodoItem(todoItem);
        }
 private async void UpdateCheckedTodoItem(TodoItem item)
 {
     // This code takes a freshly completed TodoItem and updates the database. When the MobileService 
     // responds, the item is removed from the list 
     await todoTable.UpdateAsync(item);
     items.Remove(item);
 }