Visual Basic

Method1: (the childs collection are loaded later , using lazy loading)
Dim lista as IQueryable(Of MyObj) = (From t In context.MyObjs Where(..condition..) select t).Tolist

Method2:
Dim lista as IQueryable(Of MyObj) = (From t In context.MyObjs Where(..condition..) _
            .Include(Function(t2) t2.Childs1) _
             .Include(Function(t2) t2.Childs2) _
             .Include(Function(t2) t2.Childs2.Child22) _
              .Include(Function(t2) t2.Childs1.Childs11) _
              .Include(Function(t2) t2.Childs1.Childs12) _
              Select t).ToList

Method3:
Dim lista as IQueryable(Of MyObj)
Dim lst= (From t2 In context.MyObjs Where(..condition..) Select New with _
       {    .Parent=t2
            .ch1=t2.Childs1 _
             .ch2=t2.Childs2 _
             .ch21=t2.Childs2.Child21) _
             .ch11=t2.Childs1.Childs11) _
              .ch12= t2.Childs1.Childs12 _
              ).ToList
 lista=lst.Select(Function(t2) t2.parent)

For example: Master -> Details.  Say, master has 100 rows, Details has 5000 rows (50 for each master).

If you lazy-load the details, you return 100 rows (size: master) + 5000 rows (size: details).

If you use .Include("Details"), you return 5000 rows (size: master + details).  Essentially, the master portion is duplicated over 50 times.