mobile application ball game

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C#

XAML

This is a ball game that contains an animation, a ball, and a rectangle, I need to have a life counter in the game but I don't know how to programme it, each time the ball hits the rectangle the lives decrease by 1.

<pre lang="c#">

<phone:PhoneApplicationPage 
    x:Class="PhoneApp3.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <phone:PhoneApplicationPage.Resources>


        <Storyboard x:Name="MyStory" 
                    Storyboard.TargetName="RecTrans">

            <DoubleAnimationUsingKeyFrames 
                Storyboard.TargetProperty="Y">

                <EasingDoubleKeyFrame Value="200" KeyTime="0:0:1"></EasingDoubleKeyFrame>
                <EasingDoubleKeyFrame Value="400" KeyTime="0:0:0.5"></EasingDoubleKeyFrame>
               

            </DoubleAnimationUsingKeyFrames>


        </Storyboard>


    </phone:PhoneApplicationPage.Resources>

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" removed="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="24,24,0,12">
        <TextBlock x:Name="ApplicationTitle" Text="MoveBallDemo" Style="{StaticResource PhoneTextNormalStyle}"/>
        </StackPanel>
        <Button Content="Start" Height="72"               HorizontalAlignment="Left" x:Name="btnStart"                VerticalAlignment="Top" Width="160"                Click="btnStart_Click" Margin="8,537,0,0"                Grid.Row="1" d:LayoutOverrides="HorizontalAlignment" />
        <Button Content="Stop" Height="72"                HorizontalAlignment="Left" x:Name="btnStop"                VerticalAlignment="Top" Width="160"                Click="btnStop_Click" Margin="168,537,0,0"
    Grid.Row="1" />
        <Canvas x:Name="ContentGrid" Margin="0,8,8,0" Grid.Row="1" HorizontalAlignment="Right" Width="472" Height="479" VerticalAlignment="Top">
            <Rectangle Canvas.Left="384" Canvas.Top="0" Fill="#FF00B6FF" Height="483" Name="rectangle7" Stroke="Black" StrokeThickness="1" Width="96" />
            <Rectangle Canvas.Left="100" Canvas.Top="0" Fill="#FF0065FF" Height="483" Name="rectangle5" Stroke="Black" StrokeThickness="1" Width="108" />
            <Rectangle Canvas.Left="196" Canvas.Top="0" Fill="DeepSkyBlue" Height="483" Name="rectangle6" Stroke="Black" StrokeThickness="1" Width="112" />
            <Rectangle Canvas.Left="298" Canvas.Top="0" Fill="#FF0065FF" Height="483" Name="rectangle8" Stroke="Black" StrokeThickness="1" Width="96" />
            
            <Rectangle Fill="blue"  Canvas.Left="115" Canvas.Top="182" Height="36" Name="rectangle1" Stroke="Black" StrokeThickness="1" Width="279" />
            <Rectangle x:Name="test"  Fill="Green" Height="49" Canvas.Left="220" Stroke="Black" Canvas.Top="-135" Width="46" Visibility="Collapsed">
                <Rectangle.RenderTransform>

                    <TranslateTransform x:Name="RecTrans">
                    </TranslateTransform>

                </Rectangle.RenderTransform>


            </Rectangle>
            <Rectangle Canvas.Left="0" Canvas.Top="0" Fill="DeepSkyBlue" Height="483" Name="rectangle2" Stroke="Black" StrokeThickness="1" Width="112" />
            <Ellipse x:Name="ball" Canvas.Left="144" Fill="#FF963C3C" HorizontalAlignment="Left" Height="47" Stroke="Black" StrokeThickness="1" VerticalAlignment="Top" Width="46" Canvas.Top="266" />
        </Canvas>
    </Grid>

    <!--Sample code showing usage of ApplicationBar-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="MenuItem 1"/>
                <shell:ApplicationBarMenuItem Text="MenuItem 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

namespace PhoneApp3
{

    
    public partial class MainPage : PhoneApplicationPage
    {
        public int lives =3;
        private Accelerometer _ac;
        // Constructor
        public MainPage()
        {
            InitializeComponent();
              SupportedOrientations = SupportedPageOrientation.Portrait;          
            ball.SetValue(Canvas.LeftProperty, ContentGrid.Width / 2);           
            ball.SetValue(Canvas.TopProperty, ContentGrid.Height / 2);           
            _ac = new Accelerometer();          
            _ac.ReadingChanged += ac_ReadingChanged;       
        }

        protected override void OnManipulationStarted(ManipulationStartedEventArgs e)
        {
            test.Visibility = Visibility.Visible;
            MyStory.Begin();


            base.OnManipulationStarted(e);
        }


        private void ac_ReadingChanged(object sender, AccelerometerReadingEventArgs e) 
        {
            Deployment.Current.Dispatcher.BeginInvoke(() => MyReadingChanged(e)); 
        }

        private void MyReadingChanged(AccelerometerReadingEventArgs e) 
        { 
            double distanceToTravel = 2; 
            double accelerationFactor = Math.Abs(e.Z) == 0 ? 0.1 : Math.Abs(e.Z); 
            double ballX = (double)ball.GetValue(Canvas.LeftProperty) + distanceToTravel * e.X / accelerationFactor;
            double ballY = (double)ball.GetValue(Canvas.TopProperty) - distanceToTravel * e.Y / accelerationFactor;


            Point topLeft = new Point(Convert.ToDouble(rectangle1.GetValue(Canvas.LeftProperty)), Convert.ToDouble(rectangle1.GetValue(Canvas.TopProperty)));
            Point bottomRight = new Point(Convert.ToDouble(rectangle1.GetValue(Canvas.LeftProperty)) + rectangle1.Width, Convert.ToDouble(rectangle1.GetValue(Canvas.TopProperty)) + rectangle1.Height);

            Rect temp = new Rect(topLeft, bottomRight); 
           
            //Rect temp = new Rect((double)rectangle1.GetValue(Canvas.LeftProperty), (double)rectangle1.GetValue(Canvas.TopProperty), rectangle1.Width ,rectangle1.Height);



            if (temp.Contains(new Point(ballX, ballY)) || temp.Contains(new Point(ballX + ball.Height, ballY)) || temp.Contains(new Point(ballX, ballY + ball.Width)) || temp.Contains(new Point(ballX + ball.Height, ballY + ball.Width)))
            {
                
            ballX = 0 ;
            ballY=0;
            lives--;

            }
            else
            {

                if (ballX < 0) { ballX = 0; }
                else if (ballX > ContentGrid.Width) 
                { ballX = ContentGrid.Width; } 


                if (ballY < 0) { ballY = 0; } 
                else if (ballY > ContentGrid.Height)
                { ballY = ContentGrid.Height; } 
            

            }

            ball.SetValue(Canvas.LeftProperty, ballX); 
            ball.SetValue(Canvas.TopProperty, ballY); 
        }
        

        private void btnStart_Click(object sender, RoutedEventArgs e)   
        {    if (_ac == null) 
             _ac = new Accelerometer();
                                   
             _ac.Start(); 
        }        
        
        private void btnStop_Click(object sender, RoutedEventArgs e)      
        {    if (_ac == null)  
             _ac = new Accelerometer();                  
          
            _ac.Stop();        }    
        }   
}