Is there any way to reload data of the entire DataSet?

Removing a DataSet doesn't delete its data. Off the top of my head, three ways I can think of are:

1. Delete the DataSet, update data by provider with "Delete data for symbols not contained in DataSets" option enabled, create the DataSet again. For this to work out, the symbols should not be contained in any other DataSet(s).
2. Manually delete the data files for the DataSet's symbols in %AppData%\%Provider%\%Scale%\... (see the User Guide > Data > Where data are stored.)
3. Programmatically (unsupported) Is there a way to reload chart history via an API, see code in my reply @ 8/29/2009 5:00 AM.