Package.PartExists Method (Uri)
Indicates whether a part with a given URI is in the package.
Assembly: WindowsBase (in WindowsBase.dll)
The partUri should begin with a forward-slash character "/" and be absolute from the root of the package.
For additional information, see the Open Packaging Conventions (OPC) specification available for download at http://go.microsoft.com/fwlink/?LinkID=71255.
Available since 3.0