Properties in Abstract Classes

I have 3 classes, 1 of them abstract, and the other two regular classes that inherit from the abstract class. How can I define properties in abstract classes and get them to work in the main program. If they are defined just like they are in the normal class, how can I change the properties of the abstract class in the main bit of code?

Thanks,

I'm not sure what you are asking but you can Override properties in subclasses to change them, but make sure they are declared in your base class as Overridable.

You could also declare your method / property as abstract (Must Override) and then implement them in your sub-classes.