reference from-
http://stackoverflow.com/questions/5586507/silverlight-querystring-alternative
public class ApplicationContext
{
#region Declarations
// Static instance of the application class.
private static ApplicationContext _instance;
#endregion
#region Constructor
public ApplicationContext()
{
}
// Static instance creator.
public static ApplicationContext Instance()
{
if (_instance == null)
{
_instance = new ApplicationContext();
}
return _instance;
}
//Shared properties e.g. Is available between all views
public SecurityContext UserContext { get; set; }
}
To use from a view:
CurrentUserContext = ApplicationContext.Instance().UserContext;
Hope this will help you.