Hoe to take screen shot of my page by using Silverlight(xaml)?

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Silverlight

private void Capture_Click(object sender, RoutedEventArgs e)
{

WriteableBitmap bitmap = new WriteableBitmap(1920,1080);
//WriteableBitmap bitmap = new WriteableBitmap(sourceElement, null);

if (bitmap != null)
{
SaveFileDialog saveDlg = new SaveFileDialog();
saveDlg.Filter = "JPEG Files (*.jpeg)|*.jpeg";
saveDlg.DefaultExt = ".jpeg";

if ((bool)saveDlg.ShowDialog())
{
using (Stream fs = saveDlg.OpenFile())
{

SaveToFile(bitmap, fs);
//MessageBox.Show("Complete");

}
}
}
}

private static void SaveToFile(WriteableBitmap bitmap, Stream fs)
{
int width = bitmap.PixelWidth;
int height = bitmap.PixelHeight;
int bands = 3;
byte[][,] raster = new byte[bands][,];

//Convert the Image to pass into FJCore
//Code From http://stackoverflow.com/questions/1139200/using-fjcore-to-encode-silverlight-writeablebitmap
for (int i = 0; i < bands; i++)
{
raster[i] = new byte[width, height];
}

for (int row = 0; row < height; row++)
{
for (int column = 0; column < width; column++)
{
int pixel = bitmap.Pixels[width * row + column];
raster[0][column, row] = (byte)(pixel >> 16);
raster[1][column, row] = (byte)(pixel >> 8);
raster[2][column, row] = (byte)pixel;
}
}



//Encode the Image as a JPEG
MemoryStream stream = new MemoryStream();



//Back to the start
stream.Seek(0, SeekOrigin.Begin);

//Get teh Bytes and write them to the stream
byte[] binaryData = new Byte[stream.Length];
long bytesRead = stream.Read(binaryData, 0, (int)stream.Length);
fs.Write(binaryData, 0, binaryData.Length);
}