LINQ not updating on .SubmitChanges()

Question

Is there any reason something like this would not work?

This is the logic I have used many times to update a record in a table with LINQ:

 DataClasse         


        

Answer 1

Is the InUse property a "normal" one as far as LINQ is concerned? (e.g. it's not autogenerated or anything funky like that?)

Alternatively, I don't suppose it's a Nullable<bool> is it, with a current value of null? If so, your update line isn't actually doing anything - for nullable Booleans, !null = null.

Answer 2

The table could not be updated properly because it had no primary key. (Actually it had the column but the constraint was not copied when I did a SELECT INTO my dev table). The DataContext class requires a primary key for updates.