c# - setting value's of a superclass (inheritence) -

i'm having trouble setting variables of superclass

i have following classes:

computer(superclass)

laptop(subclass)

desktop(subclass)

in supperclass computer have variable string name;

public class computer     {         protected string name;     } 

when call method changename(string yourname) laptop class, should set variable name in superclass computer, this:

public class laptop : computer {     public void changename(string yourname)     {         name = yourname;     } } 

when try name ,with properties, superclass computer, returns null. debugged see happend, , subclass laptop changed name in superclass, when method changename ended compiling, restored null.

what may have caused this?

i think setting variable

laptop.changename(name);

and trying name

computer.name.

you misunderstanding inheritance.

obviously null. because computer , laptop 2 different objects. laptop inherited doesn't mean can access computer object using laptop object.

after setting values using laptop.changename(name);. print laptop.name , name you've set.