How to get the Screen Resolution in Silverlight 4 OOB

In Silverlights OOB Application resize by resolution.

if (!Application.Current.HasElevatedPermissions)
{
throw new NotSupportedException("This method requires elevated permissions.");
}

var content = Application.Current.Host.Content;
var dispatcher = Application.Current.MainWindow.Dispatcher;

if (!content.IsFullScreen)
{
// do this asynchronously; that will also work
// in certain event handlers like FrameworkElement.Loaded
dispatcher.BeginInvoke(() =>
{
// switch to full screen
content.IsFullScreen = true;

if (!content.IsFullScreen)
{
// something went wrong
Application.Current.MainWindow.width = 0;
Application.Current.MainWindow.height= 0;
return;
}

int width = (int)Math.Round(content.ActualWidth);
int height = (int)Math.Round(content.ActualHeight);

// switch back to windowed mode
content.IsFullScreen = false;

Application.Current.MainWindow.width = width;
Application.Current.MainWindow.height= height;
});