Silverlight - passing variables between frames

Question

I have one main page in my Silverlight project. There are two frames on this page. One called Contents and the other called Footer. I wonder how I can change the variables in the content in the Content of whether this is a click event in the footer?

In Mainpage.xaml:

<UserControl
    x:Class="SilverlightApplication10.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation" 
    xmlns:uriMapper="clr-namespace:System.Windows.Navigation;assembly=System.Windows.Controls.Navigation"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">



        <Grid x:Name="NavigationGrid" >

            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
        <navigation:Frame Grid.Row="1" x:Name="Contents" 
                              Source="/Home" Navigated="ContentFrame_Navigated" NavigationFailed="ContentFrame_NavigationFailed">
            <navigation:Frame.UriMapper>
                <uriMapper:UriMapper>
                    <uriMapper:UriMapping Uri="" MappedUri="/Views/Home.xaml"/>
                    <uriMapper:UriMapping  Uri="/{pageName}" MappedUri="/Views/{pageName}.xaml"/>
                </uriMapper:UriMapper>
            </navigation:Frame.UriMapper>
        </navigation:Frame>

        <StackPanel Grid.Row="2" Background="Silver" Width="528">
            <navigation:Frame Grid.Row="1" x:Name="Footer" 
                              Source="/Home" Navigated="ContentFrame_Navigated" NavigationFailed="ContentFrame_NavigationFailed">
                <navigation:Frame.UriMapper>
                    <uriMapper:UriMapper>
                        <uriMapper:UriMapping Uri="" MappedUri="/Footer/Home.xaml"/>
                        <uriMapper:UriMapping  Uri="/{pageName}" MappedUri="/Footer/{pageName}.xaml"/>
                    </uriMapper:UriMapper>
                </navigation:Frame.UriMapper>
            </navigation:Frame>
        </StackPanel>
    </Grid>

</UserControl>

In / Views / Page 2.xaml:

<navigation:Page x:Class="PodcastPlayer.Page2"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="Page2 Page">
  <Grid x:Name="LayoutRoot">
        <MediaElement x:Name="player"   />
    </Grid>
</navigation:Page>

In / Footer / Page 2.xaml:

<navigation:Page x:Class="PodcastPlayer.Page2Fotter"
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="Page2 Page">
  <Grid x:Name="LayoutRoot">
        <StackPanel  Orientation="Horizontal" >
            <StackPanel Height="30" Width="60" Background="Red">
                <TextBlock Padding="10" Foreground="White">Back</TextBlock>
            </StackPanel>

            <StackPanel Height="30" Width="60" Margin="10,0,0,0" Background="DarkGreen">
                <TextBlock x:Name="playtext" Padding="10" Foreground="White">Play</TextBlock>
            </StackPanel>

            <StackPanel Height="30" Width="60"  Margin="10,0,0,0" Background="Red">
                <TextBlock Padding="10" Foreground="White">Next</TextBlock>
             </StackPanel>   
        </StackPanel>
    </Grid>
</navigation:Page>

I want the player to play the contents of the media element in the "Content" section when I click the Play button in the footer.

player.Play()

The program I am writing is located in VB.NET. But C # examples are also greatly appreciated!

Answer 1

- :

public class DataClass
{
    public static MediaElement player;
}

, , :

DataClass.player.Play();

Answer 2

- , . , Navigated , , , Content NavigationEventArgs. , , , .

.

, , . , , , . , MainPage.xaml, FindName().