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We have a legacy database we cannot change the database schema because many systems run on it. the database designer divided a business entity persist into two database tables. for example, Product table is (ProductId, Name, ...), ProductPhoto table is (ProductId, Photo), product's photo field is...
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Well, I will answer my own question and donate my two cents to the missing documentation: For a one to one relationship insert from GUI the DeepSave method is out of context, one can simply use the OneToOneViewRelationship control to transfer the new primary key value from the main table to the refering...