security - How to prevent others from using my .Net assembly?

Question

I have an assembly which should not be used by any application other than the designated executable. Please give me some instructions to do so.

Answer 1

You can sign the assembly and the executable with the same key and then put a check in the constructor of the classes you want to protect:

public class NotForAnyoneElse {
  public NotForAnyoneElse() {
    if (typeof(NotForAnyoneElse).Assembly.GetName().GetPublicKeyToken() != Assembly.GetEntryAssembly().GetName().GetPublicKeyToken()) {
      throw new SomeException(...);
    }
  }
}