protected void DDLYear_SelectedIndexChanged(object sender, EventArgs e)
 {
     GenericVehicle gv = new GenericVehicle();
     //Vehicle EngineSize
     //Need to clear the combobox before adding new items
     DDLEngineSize1.Items.Clear();
     DDLEngineSize1.Items.Insert(0, "");
     foreach (string engineSize in gv.SearchVehicleEngineSize(DDLModel.Text, DDLYear.Text))
     {
         DDLEngineSize1.Items.Add(engineSize);
     }
     DDLEngineSize1.Text = "";
 }
 protected void YearDDL_SelectedIndexChanged(object sender, EventArgs e)
 {
     GenericVehicle gv = new GenericVehicle();
     //Vehicle EngineSize
     //Need to clear the combobox before adding new items
     EngineSizeDDL.Items.Clear();
     FuelTypeDDL.Items.Clear();
     EngineSizeDDL.Items.Insert(0, "");
     foreach (string engineSize in gv.SearchVehicleEngineSize(ModelDDL.Text, YearDDL.Text))
     {
         EngineSizeDDL.Items.Add(engineSize);
     }
     EngineSizeDDL.DataBind();
 }