If you are trying to understand something new, I think it is more important to have a good explanation than a code snippet. To give code-ready to go is not the usual policy of Codeproject (although there is plenty of articles, tips and other solved question with code).
One very good point to start (specially with generic or wide question as yours) is the net.
Please have a look:
http://lmgtfy.com/?q=read+values+of+controls+with+Jquery[
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and don't hesitate to come back and ask something more concrete when you get stuck, have a problem or don't understand a particular aspect.
Another thing you should read is
http://www.codeproject.com/Messages/2922875/HOW-TO-ASK-A-QUESTION.aspx[
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