Dropdown List sql datasource + hardcoded field

CSharp kode 

 private List<objDropdown> ddManufactureDataSource()
     {
         List<objManufacture> lstManufactures = BLL.GetAllManufactures();
 
         List<objDropdown> ddManufactures = new List<objDropdown>();
 
         objDropdown newItem = new objDropdown();
         newItem.TextField = "-Choose Producer-";
         newItem.ValueField = 0;
         ddManufactures.Add(newItem);
 
         foreach (var item in lstManufactures)
         {
             objDropdown newItem2 = new objDropdown();
             newItem2.TextField = item.ManufactureName;
             newItem2.ValueField = item.ManufactureID;
             ddManufactures.Add(newItem2);
         }
 
         return ddManufactures;
     }

CSharp kode 

 dropDownList.Items.Add("test","test");