ZiShan,
There is a way to do that,
just place a > in the format property of the field in the table and the same in the format property of the text box in the form and it should do the trick.
having it only in the form will display as caps, but will store as lower case, having it in the table o=alone will store as caps but display as it was entered, having it in both will display and store as caps.
for more information on this place your cursor in the INPUT MASK propeerty in the table design view and press f1, this should bring up help on this topic.
idd