What's the equivalent of this Ms access in vb.net

SELECT COURSE_ID, COURSE_NAME FROM COURSES WHERE (COURSE_ID NOT IN (SELECT COURSE_ID FROM COURSES_TAKEN WHERE  UST_ID=1204));

I want to do it like:

Dim dass As New OleDbDataAdapter("SELECT COURSE_ID, COURSE_NAME FROM COURSES (WHERE COURSE_ID NOT IN (SELECT COURSE_ID FROM COURSES_TAKEN WHERE  UST_ID= " & User_ID));, cnss)

Or what's the proper syntax...?

Esam