ExtendedProperty.MarkForDrop Method (Boolean)
Marks the object so that it will be dropped the next time the Alter method is called for its parent object.
Assembly: Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)
If True, the extended property is dropped when the Alter method is run on the parent object.
If False, the extended property is not dropped when the Alter method is run on the parent object.