how to show multiple column in one column?

Question

Hello dear
i m a new employee . i face a problem to show description 1 and description 2 in one column
 if any body help me best regurds,
my code--------

var st = from s in db.specSheets select new { s.AccList, s.descrip1+"_"+ s.descrip2, s.Quantity };

GridView4.DataSource = st;

GridView4.DataBind();

its show an error