The DELETE statement conflicted with the REFERENCE constraint in ASP.NET Dynamic Data
You can implement a cascading delete for Application_User_Access table. For this you need to modify your DB schema a little bit. Concretely remove the previous reference from the Application_User_Access to the Application_User table and add a new one:
--not sure about the column names thoughALTER TABLE Application_User_AccessADD CONSTRAINT FK_Application_User_Access_Application_UserFOREIGN KEY (used_id)REFERENCES Application_User(id)ON DELETE CASCADEGONotice that ON DELETE CASCADE thing. It means that whenever the primary key record is deleted the foreign key record referencing it will be removed as well.