Question

Using sql server profiler I can see that the initial query for AnswerComment is going to the db but when I get to the ef.SaveChanges() nothing is getting to the db. I’m using sqlexpress 2008 R2.

using (TPRDEntities ef = new TPRDEntities())
{
    var ac = ef.AnswerComments.Where(a => a.AnswerCommentID == answercomment.AnswerCommentID).FirstOrDefault();

    if (ac == null)
    {
        ac = new AnswerComment();
        ac.AnswerID = answercomment.AnswerID;
        ac.DisplayText = answercomment.DisplayText;
        ac.InsertDate = answercomment.InsertDate;
        ac.InsertUser = "save test user";
        ef.SaveChanges();
    }
}

Answer 1

The new instance you create

ac = new AnswerComment();  

is not known to EF. It is a brand-new object instance that EF has not seen before.

You will have to add it to ef.AnswerComments

ef.AnswerComments.Insert(ac);

Also, ensure that ChangeTracking is active for ef.