Hi,
 I have a .NET assembly (a dll which has a strong name). It has two
classes. This dll is used in more than one application.

 When the applications are distributed, the dll is also available for
anybody. I want to secure the assembly(dll), so that the class in the
assembly is inaccesible to the users.

I tried  using LinkDemand in the dll.
[StrongNameIdentityPermission(SecurityAction.LinkDemand,
        PublicKey = "")]

The problem with that is,  iam not able to use the dll myself.  I get
the following errror when instatiating a class in the dll. How do i get
access to the class but not others?

Error:
An unhandled exception of type 'System.Security.SecurityException'
occurred in Unknown Module.

Additional information: Request for the permission of type
System.Security.Permissions.StrongNameIdentityPermission, mscorlib,
Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
failed.

Thanks
sendhil