windows applications and web forms

I want to build a little system to some school.
I want the users of this system to have a windows application based program.

On the other hand I want them to be able from home ... but this time I need web forms.

My question is if there is a way to build the GUI only for both web and windows application and get the functions from the same place say : example.cs

I tryed to call a source code of another project but it didn't work for me (I guess it's because of the namespace).

:confused:

make use of

1) UserControls
2) Custom Controls
3) make re-usable libraries

so that you can use both ways.
just need to design a different approach.
for example

you can have a global or config file whether at runtime is it an web app or a desktop
depending upon that use the controls

Actually its all about designing issue and a vast topic to discuss.

thanx
Paresh