Public Shared Function GetNormalizedPartUri ( _
    partUri As Uri _
) As Uri

Dim partUri As Uri
Dim returnValue As Uri

returnValue = PackUriHelper.GetNormalizedPartUri(partUri)

public static Uri GetNormalizedPartUri(
    Uri partUri
)

public:
static Uri^ GetNormalizedPartUri(
    Uri^ partUri
)

public static function GetNormalizedPartUri(
    partUri : Uri
) : Uri

You cannot use methods in XAML.