The WIA 2.0 item category ID. For a list of available categories, refer to WiaCategories.
The relevant System.Guid value for the category Id passed as parameter for the GetCategoryGuid method.
This method is only used when using WIA version 2.0. Each WIA 2.0 item has a category represented as a System.Guid structure that can be retrieved by calling the GetPropertyGuid method, and passing the WiaPropertyId.ItemCategory for the propertyId parameter of this method. To determine the relevant category for returned System.Guid values, call the GetCategoryGuid method for each available category in the WiaCategories enumeration and then compare the returned System.Guid values with this one.
For an example, refer to WiaSession.GetPropertyGuid.