ForeignKey.MarkForDrop Method (Boolean)
Marks the foreign key to be dropped the next time its parent Table object is altered by the Alter method.
Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)
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public void MarkForDrop(
A Boolean value that specifies whether to drop the foreign key when its parent Table object is altered with the Alter method.
If True, the foreign key is dropped when the Alter method is run on the parent Table object.
If False, the foreign key is dropped immediately.