Crystal Reports also supports the Crystal Data Source Type Library, for implementing in a Visual Basic class definition. Crystal Data Source objects can also be passed to the Active Data Driver as ActiveX data sources. However, the Crystal Data Source Type Library exposes a complete COM interface that must be implemented in your class. CDO, on the other hand, provides a fast and simple method for producing an internal customized ActiveX data source.
If you need to implement a complete data source in your application that allows runtime movement through records and fields, or if you intend to implement your data source as a separate ActiveX component, consider using the Crystal Data Source Type Library. However, if you need to create a quick and simple means of storing a large amount of data in a convenient package for reporting on, and the data will remain inside the same application as the reporting functionality, then use Crystal Data Objects.
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