silverlight - How to use StaticResource

how to use StaticResource in silverlight
MainPage.xaml

<UserControl x:Class="SilverlightApplication3.MainPage"
    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" d:DesignHeight="600" d:DesignWidth="800">
    <UserControl.Resources>
        <LinearGradientBrush x:Key="BackgroundBrush">
            <LinearGradientBrush.GradientStops>
                <GradientStop Offset="0.00" Color="Red"/>
                <GradientStop Offset="0.50" Color="Green"/>
                <GradientStop Offset="1.0" Color="Blue"/>
            </LinearGradientBrush.GradientStops>
        </LinearGradientBrush>
    </UserControl.Resources>
    <StackPanel x:Name="LayoutRoot" Orientation="Vertical" VerticalAlignment="Top">
        <TextBlock 
            Name="TextBlock1" 
            Height="82" 
            HorizontalAlignment="Left" 
            Margin="20,9,0,0" 
            Text="how to use StaticResource in silverlight"
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="20"
            FontStyle="Italic"
            Foreground="MidnightBlue"
            Width="600"
            Padding="25,10,10,0"
            />
        <Border BorderThickness="1" BorderBrush="AliceBlue"></Border>
        <TextBlock 
            x:Name="Text2" 
            Foreground="{StaticResource BackgroundBrush}" 
            FontSize="50" 
            Height="132"
            >
            this is a sample text
        </TextBlock>
        <TextBlock 
            x:Name="Text3" 
            Foreground="{StaticResource BackgroundBrush}" 
            FontSize="50" 
            Height="145"
            >
            this is another sample text
        </TextBlock>
    </StackPanel>
</UserControl>
MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }
}
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