There is a DataFiles property in Crystal Report Control.
example :
   CrystalReport1.DataFiles(0)=app.path & "\db1.mdb" 
   CrystalReport1.DataFiles(1)=app.path & "\db2.mdb"
The order of files in the array must conform to the order of files in the 
report. (You can use the Database|Set Location command to determine the 
order of files in the report.)
For further information, you can get it in Crystal Report Developer's Help
(Search for DataFiles property)
I hope this will help.

> if I have multiple tables(that means I have multiple "databases" under 
the 
> Crystal report: Set Location, how can I connect to those "databases"