Remember every time you ask for a raise does not mean your going to get one! Sometimes you will get a raise when you ask for one.
If your employer turns you down. Don't get mad at your employer. Remain calm. Keep your cool about your self. Ask your employer why you were turned down. How can you improve for a raise for next time. Find out if you could get some more coaching or on the job training. This may increase your chance of getting a raise the next time. Ask your employer for his or her suggestions for you? Ask if you have put in enough time and effort for a raise? Do you need more skills for a raise? Find out how and what you need to do, for a raise?