Deleting Properties
The System.DirectoryServices.AccountManagement API provides a very simple way to delete properties: simply set the property's value to NULL. It is particularly important to do this when deleting properties that have a String value; setting a property to an empty string is not allowed; to delete a property with a String value, set it to NULL.
See Also
Reference
System.DirectoryServices.AccountManagement
Concepts
About System.DirectoryServices.AccountManagement
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