How to make canvas detect touch input correctly in C #?

Basically, I'm trying to get the canvas to listen to touch input (tap) and will increase the number of taps on the screen. It does not work when I touch the screen on my device. I debugged my code, and there was nothing unusual, except that the sensor was not detected. I checked ZIndex and the canvas is in front of the screen to be tangible. How can I make it work?

XAML:

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
        <TextBlock Name="counter" FontSize="150" HorizontalAlignment="Center" TextWrapping="Wrap" Text="0" VerticalAlignment="Center" Margin="188,10,187,397"/>
        <Button Content="Reset" HorizontalAlignment="Stretch" Margin="-18,535,-18,0" VerticalAlignment="Top" Click="Button_Click"/>
        <Canvas ZIndex="0" Name="Canvas" HorizontalAlignment="Center" Height="535" VerticalAlignment="Top" Width="446" MouseLeftButtonDown="Canvas_MouseLeftButtonDown" MouseLeftButtonUp="Canvas_MouseLeftButtonUp" MouseLeave="Canvas_MouseLeave"/>

</Grid>

WITH#

int taps = 0; // create var to detect number of times, user touches the screen

    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }

    // method to register the touch as the finger is placed on the screen
    private void Canvas_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        //Canvas c = sender as Canvas;
        counter.Text = "TOUCHED!";
    }

    //method register the touch as the finger is lifting up from the screen
    private void Canvas_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        //Canvas c = sender as Canvas;
        taps++;
        counter.Text = taps.ToString(); //convert var from int to string
    }

    //method register the touch as the finger leaves the area of the screen
    private void Canvas_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
    {
        //Canvas c = sender as Canvas;
        MessageBox.Show("You left the screen without lifting your finger. That does not count as a tap!", "Caution!", MessageBoxButton.OK);
    }

    // method to reset the counter to zero when button is pressed and released
    private void Button_Click(object sender, RoutedEventArgs e)
    {
        taps = 0; // reset the count
        counter.Text = taps.ToString(); // convert var from int to string
    }