Adding an XMP tag to jpg metadata

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C#

Has anyone added an XMP tag to a jpg file using the capabilities of the
System.Windows.Media namespace?

I have been using this namespace for adding EXIF tags and have also used ChilKat XMP to add the XMP tags. However, using these both together requires reading/writing the image file twice. My preference is to use the native capabilities of the .net metadata functionality without third-party code.

My requirements are to add some new tags to the existing metadata from a Canon camera while keeping all the old Canon-specific tags. The new tags are both EXIF tags and XMP tags.

-- Jim