This is a string that contains parameters which can be reach after navigation complete by NavigationContext.QueryString property. The format must be as follow: /param1/param2…/paramN. Each parameter must be separated by ‘/’.
If you pass only one parameter you don't need to write '/' sing.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2