Question

I am teaching myself about the entity framework using a tutorial found at http://msdn.microsoft.com/en-us/data/jj591506.

using (var db = new DatabaseEntities())
{
            // Section 1
            var section = new Section
            {
                SectionID = 1,
                SectionLetter = "d"
            };
            db.Sections.Add(section);
            db.SaveChanges();

            // Section 2

            var query = from b in db.Sections 
                        orderby b.SectionLetter
                        select b;

            foreach (var item in query)
            {
                this.Title = item.SectionLetter;
            }
}

When I use section 1 and section 2 of the code above together they work well. However, when I run just Section 2 the title does not change which means it does not even return a single item and thus does not enter the foreach loop. I can’t see why it would not enter the loop.

I realise there is probably an obvious answer to this question but I thought I should ask on stackoverflow rather than ask a colleague so others with the same question could find an answer.

I suspect there might be a clue in this question: System.Data.Entity not working as expected for MVC Entity Framework. Unfortunately I can’t seem to work it out.

Answer 1

It looks like the line var db = new DatabaseEntities() is connecting to a database that doesn’t have any rows. Check the Connection property of db to make sure it is on the correct server/instance/file.

You should be able to see the contents of the table if you perform a “Quick Watch” on query.ToArray().