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How can I migrate a temp table using LINQ to SQL?
// migrate temp profile(s)...
            var tempProfilesToMigrate = from ct in db.contact_temps
                                         where ct.SessionKey == contact.Profile.SessionId
                                         select new contact();


            db.contacts.InsertAllOnSubmit(tempProfilesToMigrate);
            db.SubmitChanges();

            //...clear temp table records
            var tempProfilesToDelete = from ct in db.contact_temps
                                        where ct.SessionKey == contact.Profile.SessionId
                                        select ct;

            db.contact_temps.DeleteAllOnSubmit(tempProfilesToDelete);
            db.SubmitChanges();

// migrate temp profile(s)...
var tempProfiles = from ct in db.contact_temps
                             where ct.SessionKey == contact.Profile.SessionId
                             select ct;

foreach (var c in tempProfiles)
{
    Contact newC = new Contact();
    newC.Name = c.Name;
    // copy other values

    db.contacts.InsertOnSubmit(newC);
}

// WAIT! do it at once in a single TX => avoid db.SubmitChanges() here.

 db.contact_temps.DeleteAllOnSubmit(tempProfiles);

 // Both sets of changes in one Tx.
 db.SubmitChanges();