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To add a Tapped event to the CheckBox control in Xamarin.Forms, follow these steps:

1. Add a CheckBox control to your XAML file:

   <CheckBox Text="Checkbox 1" />
   

2. Set the Name property of the CheckBox control to a unique name:

   <CheckBox x:Name="myCheckbox" Text="Checkbox 1" />
   

3. In the code-behind file for your page (e.g. MainPage.xaml.cs), add a method to handle the Tapped event:

   private void MyCheckbox_Tapped(object sender, EventArgs e)
   {
      // Do something when the checkbox is tapped
   }
   

4. Register the event handler method with the Tapped event of the CheckBox control in the constructor or OnAppearing method of your page:

   public MainPage()
   {
      InitializeComponent();
   
      myCheckbox.Tapped += MyCheckbox_Tapped;
   }
   

   or

   protected override void OnAppearing()
   {
      base.OnAppearing();
   
      myCheckbox.Tapped += MyCheckbox_Tapped;
   }
   

Now, when the user taps on the checkbox, the MyCheckbox_Tapped method will be executed, and you can add your own code to handle the event as needed.