>Can someone tell me how to protect a class so it cannot be changed? I'm writing a class to unpack a string and don;t want it to be changed once I'm done?
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>Thank you

Make a backup copy of the vcx and vct, then

USE The.VCX 
REPLACE ALL Methods WITH ""
USE

That will wipe out the source code from the class library and if anyone tries to edit it the classes will fail to work anymore.