error:cannot convert type 'Tblname' to "System.Data.DataRow'

Question

 var objCategory = (from C in objbidportalEntity.bp_category select C).ToList();

                       

                        foreach (DataRow dr in objCategory) // Loop through List with for

                        {

                            ddlCategory.Items.Add(new ListItem(dr[1] + " - " + dr[2].ToString(), dr[0].ToString()));

                         }

i got an error  in foreach