webcam & take a picture using silverlight in asp.net

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C#

ASP.NET

hello my question is
click on start camera button video should be display & after that click on take picture button picture should be capture.But using this code error display on CaptureDeviceConfiguration.AllowedDeviceAccess;

I have made one application which is I have took two buttons,one image,one rectangle.
1)Start Camera
2)Take Picture

Click on Start Camera ->object allows you to capture audio and video from your computers webcam and microphone.
Click on Take Picture ->Picture should capture.

Code is as follows
Source Code

<usercontrol x:class="WebCamera.MainPage" xmlns:x="#unknown">
    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="300" d:DesignWidth="400">

    <grid x:name="LayoutRoot" removed="White">
        <grid.rowdefinitions>
            <rowdefinition height="32" />
            <rowdefinition />
        </grid.rowdefinitions>
        <grid.columndefinitions>
            <columndefinition />
            <columndefinition />
        </grid.columndefinitions>
        <Button x:Name="startVideo" Grid.Row="0" Grid.Column="0" Content="Start Camera!" Click="startVideo_Click" />
        <Button x:Name="snap" Grid.Row="0" Grid.Column="1" Content="Take Picture!" Click="snap_Click" IsEnabled="False" />
        <Image x:Name="snapImage" Grid.Row="1" Grid.Column="1" />
        <rectangle x:name="video" grid.row="1" grid.column="0" />
    </grid>
</usercontrol>

UI Code

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;
using System.IO;

namespace WebCamera
{    public partial class MainPage : UserControl    
     {    private CaptureSource cs = null;
          public MainPage()        
          {
                InitializeComponent();
          }
        
          private void startVideo_Click(object sender, RoutedEventArgs e)        
          {            
                bool ok = CaptureDeviceConfiguration.AllowedDeviceAccess;
            
                if (!ok)            
                {                
                    ok = CaptureDeviceConfiguration.RequestDeviceAccess();            
                }
  
                if (ok)            
                {                
                    cs = new CaptureSource()                
                        {                    
                            VideoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice()                
                        };

                    VideoBrush vidBrush = new VideoBrush();                
                    vidBrush.SetSource(cs);                
                    video.Fill = vidBrush;                
                    cs.Start();
                    snap.IsEnabled = true;            }        }
            private void snap_Click(object sender, RoutedEventArgs e)        
            {            
                cs.AsyncCaptureImage((bitmap) = >            
                {                
                    Dispatcher.BeginInvoke(() =>                
                    {                  
                        snapImage.Source = bitmap;                
                    });            
                });        
    }    
}}