Using OLEDB to connect to a MS Access 2007 file
Unless I misunderstand, you are using unfiltered user input from txtEntryID.
Never trust user input.

What if the user fills txtEntryID with 123 OR 1=1?
The query will delete everything:

DELETE FROM PersonalData WHERE DataID = 123 OR 1=1


What if, then, the user inputs 123; UPDATE Account SET credit = 1000 WHERE userId = me:

DELETE FROM PersonalData WHERE DataID = 123; UPDATE Account SET credit = 1000 WHERE userId = me