thisform.page1 is the data entry page with textboxes and combo boxes and a save button that contains the following statement :

INSERT INTO course (cid, c_title, semester, year)
VALUES (thisform.page1.cid, thisform.page1.c_title, thisform.page1.semester, thisform.page1.year)

Everytime I run it, it will tell me "Property CID not found". cid is the primary key for my course table and there is a textbox on the form named "cid". I just want to insert that value on the textbox to the table.

Why is CID not found? Any idea?