silverlight - How to change Label text color programmatically

how to set change Label foreground (font text color) programmatically in silverlight
MainPage.xaml 

<UserControl 
    x:Class="SilverlightApps.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" 
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
    >

    <Grid x:Name="LayoutRoot" Background="White">
        <Rectangle
            Name="Rectangle1"
            Fill="AliceBlue" 
            HorizontalAlignment="Left" 
            Height="82" 
            Margin="20,12,0,0" 
            Stroke="Black" 
            VerticalAlignment="Top" 
            Width="600"
            StrokeThickness="0"
            />

        <TextBlock 
            Name="TextBlock1" 
            Height="82" 
            HorizontalAlignment="Left" 
            Margin="20,9,0,0" 
            Text="how to set change Label foreground (font text color) programmatically in silverlight"
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="20"
            FontStyle="Italic"
            Foreground="MidnightBlue"
            Width="600"
            Padding="25,10,10,0"
            />

        <sdk:Label
            Name="Label1"
            HorizontalAlignment="Left" 
            Margin="82,122,0,0" 
            VerticalAlignment="Top" 
            FontSize="20"
            Content="Sample Label1 For Test Foreground"
            FontFamily="Comic Sans MS"
            />

        <sdk:Label
            Name="Label2"
            HorizontalAlignment="Left" 
            Margin="82,180,0,0" 
            VerticalAlignment="Top" 
            Content="Sample Label2 For Test Foreground"
            FontFamily="Comic Sans MS"
            FontSize="20"
            />

        <Button
            Name="Button1"
            Content="Change Label Foreground" 
            HorizontalAlignment="Left" 
            Height="40" 
            Margin="82,241,0,0" 
            VerticalAlignment="Top" 
            Width="252"
            FontWeight="SemiBold"
            Click="Button1_Click"
            />
    </Grid>
</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 SilverlightApps
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void Button1_Click(object sender, RoutedEventArgs e)
        {
            //this line make label foreground crimson
            Label1.Foreground = new SolidColorBrush(Color.FromArgb(255,220,20,60));

            //this line make label foreground dark green
            Label2.Foreground = new SolidColorBrush(Color.FromArgb(255, 0, 100, 0));
        }
    }
}
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