Does anyone know how to create classes and apply it without occur any error correctly...

I find that most of my coding is inside the forms and i am not using any classes at the monent...

thus i find it quite hard if i need to change the coding......i would search all the forms just for the word that i need to change..

Therefore i am eager to change my style of coding and uses classes more instead..

This is quite basic..

Can anyone sent me some useful links, advise or tutorials about that..

Thanks