protected void DDLEngineSize1_SelectedIndexChanged(object sender, EventArgs e)
 {
     GenericVehicle gv = new GenericVehicle();
     DDLFuelType.Items.Clear();
     DDLFuelType.Items.Insert(0, "");
     foreach (string fuelType in gv.SearchVehicleFuelType(DDLModel.Text, DDLYear.Text, DDLEngineSize1.Text))
     {
         DDLFuelType.Items.Add(gv.FuelTypeCheck(fuelType));
     }
 }
 protected void EngineSizeDDL_SelectedIndexChanged(object sender, EventArgs e)
 {
     GenericVehicle gv = new GenericVehicle();
     //Vehicle FuelType
     //Need to clear the combobox before adding new items
     FuelTypeDDL.Items.Clear();
     FuelTypeDDL.Items.Insert(0, "");
     foreach (string fuelType in gv.SearchVehicleFuelType(ModelDDL.Text, YearDDL.Text, EngineSizeDDL.Text))
     {
         FuelTypeDDL.Items.Add(gv.FuelTypeCheck(fuelType));
     }
     FuelTypeDDL.DataBind();
 }