Redirect Page

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Silverlight

Hi,
I have used MVVM model in silverlight application.
In my login control I have bind LoginCommand to my button.

Command="{Binding LoginCommand}"

The authentication logic is written in ViewModel Class file. After authentication i want to redirect this page to Main page. I don't know how to do it.

I have used following code:

System.Windows.Navigation.NavigationService obj = new System.Windows.Navigation.NavigationService();

obj.Navigate(new Uri("/Home",UriKind.Relative));

But its giving error
System.Windows.Navigation.NavigationService has no constructors defined.

Please let me know if you have any solution.
Thanks