Modifying obsolete attribute

Question

Hi all - would like to write a custom attribute, which, when applied to a constructor will make the compiler issue a warning. Just like the Obsolete Attribute, but with a name of my choosing. For e.g. instaed of generating message "This method is Obsolete", it should display a message "This method can not be called from here", because logically that method is not obsolete, but should not be called from that class. Can't override the ObsoleteAttribute class - it's marked sealed. Am I just stuck with [Obsolete]? Any ideas very gratefully received. Shantanu