Why is Entity Framework not bringing relationship collections?

Answer 1

Use Include:

var users = from u in db.Users.Include("Areas")
            where u.Name.StartsWith("F")
            select u;

Also change this code:

if(users.Count() > 0) // executes query
{
    var dto = users.First(); // executes it again
}

to:

var dto = users.FirstOrDefault(); // execute once
if (dto != null)
{
    // ...  
}