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Important Observations
- Compared with exercise WBF110 you will notice very little difference when expanding a tree level. In both cases, you have already retrieved the data from the server.
- In this example, you populate each level when it is expanded, from a working lists which you have already downloaded.
- For a database having a large number of records, you may decide to populate level 1 and retrieve level 2 and 3 from the server when required.
- For files with a much larger number of records, you could limit the tree to a range of records at level 1.
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- How to implement a tree which loads on demand using the List control.
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