Add new search scope into display group

Go to Site Setting on your intranet, under Site Collection Administration, click Search Scope.

Select Search Dropdown and tick the search scope

Datatable sort and iteration

Datatable dt = ???;

 dt.DefaultView.Sort = SortByName;

            int i = 1;
            foreach (DataRowView da in dt.DefaultView)
            {
               _results.Add(CreateEntry(i, DateTime.Today, da["Title"].ToString(),
                            da["Path"].ToString(), da["Author"].ToString(), da["HitHighlightedSummary"].ToString()));
               i++;
            }