How to Binding the MainPage's variable in XAML

Question

public sealed partial class MainPage : Page
public double StatusbarOpacity { get; set; }//Slider's value binding
public MainPage()
this.InitializeComponent();
<Slider Value="{Binding StatusbarOpacity}" Maximum="100" Background="DarkOrange" BorderBrush="Red" Foreground="Blue" Header="Opacity" IntermediateValue="10"/>

Answer 1

Set the DataContext of the MainPage to itself:
public MainPage()
this.InitializeComponent();
this.DataContext = this;
...or Set the dataContext of the Slider:
public MainPage()
this.InitializeComponent();
slider.DataContext = this;
<Slider x:Name="slider" Value="{Binding StatusbarOpacity ...>
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