Most efficient way to update with LINQ to SQL

Question

Can I update my employee record as given in the function below or do I have to make a query of the employee collection first and then update the data?

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Answer 1

You can attach a unattached modified entity, by using this overload:

db.App3_EMPLOYEEs.Attach(employee, true);//Attach as modfieied

Note that for this to work you need in your table a "Version" column of type "timestamp"