
Originally Posted by
isladar
Just getting a good grade in a course isn't going to equate to a recommendation. You should make the attempt to interact with the professor outside of the class (office hours, extra help, bringing up other points regarding the lecture) so they have an idea as to who you are, what your goals are, etc.
Really though, you're asking a professor to write what he or she knows about you and their experience with you, so unless you've taken the time to express that, they won't have much of anything to write.