>>Build the Class Libraries in the EXE. Do not distribute them as a separate files.
>
>If i want to sell them then what?
You give the client only the EXE, not the original files that make up the EXE (forms, classes, menus, PRGs - everything is inside the EXE).
>and how i can use them when the are exe?
To make changes in the future, you keep the original files (forms, menus, etc.). But you give the client only the EXE.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
