How to validate calling assembly?

I'm creating a common .net dll for use by multiple projects (applications).
I want to ensure that only my applications (my code) can use the above dlls.
Is it possible to sign the dll or place some attribute/code such that only
my dlls (developed/signed by me) can use the dll?

basically i want to prevent others from being able to use my DLL?

Hello,

Short answer: You can't.

Long answer: You can make in somewhat harder to prevent other people from
using your code. But in the end, if they have the assembly on their machine
they can just decompile it and remove your protection. Now you can check the
callstack and use an obfuscator to make it harder.

To really prevent other parties from using your code you'll have to keep it
from them (using a WebService for example, which might or might not be an
option in your case).

Kind regards,
Henning Krause

"Don" <Don (AT) discussions (DOT) microsoft.com> wrote

I'm creating a common .net dll for use by multiple projects
(applications).
I want to ensure that only my applications (my code) can use the above
dlls.
Is it possible to sign the dll or place some attribute/code such that only
my dlls (developed/signed by me) can use the dll?

basically i want to prevent others from being able to use my DLL?