What happens if the judge holds you in contempt for violating a court order? Please let me know asap.

Normally you are given a fine. It is possible to be placed in jail till you agree to correct, or correct the situation you are being held in contempt for.

For example if you are the custody parent and you will not allow visitation, the judge may fine you 100 dollars each time you refuse visits.
If you are the person paying child support, he may place you in jail till you make payment arrangements