How make sure C# Ensure integrity?(DLL not modified)

How make sure C# Ensure integrity?(DLL not modified)

I have one C# application. when it release before pakage, I'm use
IntelliLock encrypted it. and use startssl digital-signature it.(actually
I don't know how use it , just for safe)
but I'm still worry about this: there is 1 or 2 dll use check use
identity, and very small. I worry it be modify and replace by same name .
then application will not check identity.
So my problem is , is there any way to check the dll is not be modify
after the IntelliLock and startssl digital singed step?
thank you very much.