Validating combo-box values with arrays

Sorry for the confusing subject as I'm a bit confused myself..

Anyways can anyone help me find the best way to validate user input on two combo boxes at the same time? Basically what my program does is display a random number and the user must select the correct response from the first and second combo boxes and then the answers need to be validated. The first combo box is setup as an array with 10 items and the second combo box has 7 items. What would be the best way to accomplish this?


Oh and I'm using C# 2008 Express edition. Thanks for any help!