Question

DataClassesDataContext MyDB = new DataClassesDataContext();
var id = from wineT in MyDB.Wineries
         where wineT.wineryID==Convert.ToInt32(
             from w in MyDB.WineTypes
             where w.kind==ddlSorti.SelectedItem.Text
             select w.wineryID)
         select  wineT.name;

GridView1.DataSource = id;
GridView1.DataBind();

I have this code and I don’t have any errors, but when I start the application I get this error “Could not format node ‘ClientQuery’ for execution as SQL”.

Answer 1

You need to add FirstOrDefault() in your sub select

var id = from wineT in MyDB.Wineries
         where wineT.wineryID==Convert.ToInt32(
             from w in MyDB.WineTypes
             where w.kind==ddlSorti.SelectedItem.Text
             select w.wineryID).FirstOrDefault()
         select  wineT.name;