protected void GridView_SelectedIndexChanged(object sender, EventArgs e)
 {
     RouteId.Visible         = true;
     RouteName.Visible       = true;
     VehicleDropDown.Visible = true;
     UpdateVehicle.Visible   = true;
     RouteId.Text            = GridView.SelectedRow.Cells[1].Text;
     RouteName.Text          = GridView.SelectedRow.Cells[3].Text;
     using (SqlConnection conn = new SqlConnection(DBstring))
     {
         String         q1  = "SELECT VehicleID,Number from Vehicle where Status = 'Active'";
         SqlDataAdapter sda = new SqlDataAdapter(q1, conn);
         DataTable      dt1 = new DataTable();
         sda.Fill(dt1);
         if (dt1.Columns.Count != 0)
         {
             VehicleDropDown.DataSource     = dt1;
             VehicleDropDown.DataTextField  = "Number";
             VehicleDropDown.DataValueField = "VehicleID";
             VehicleDropDown.DataBind();
             ListItem liVehicle = new ListItem("Select Vehicle", "-1");
             VehicleDropDown.Items.Insert(0, liVehicle);
         }
     }
 }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                using (SqlConnection conn = new SqlConnection(DBstring))
                {
                    String         q1  = "SELECT VehicleID,Number from Vehicle where Status = 'Active'";
                    SqlDataAdapter sda = new SqlDataAdapter(q1, conn);
                    DataTable      dt1 = new DataTable();
                    sda.Fill(dt1);
                    if (dt1.Columns.Count != 0)
                    {
                        VehicleDropDown.DataSource     = dt1;
                        VehicleDropDown.DataTextField  = "Number";
                        VehicleDropDown.DataValueField = "VehicleID";
                        VehicleDropDown.DataBind();

                        ListItem LiVehicle = new ListItem("Select Vehicle", "-1");
                        VehicleDropDown.Items.Insert(0, LiVehicle);
                    }
                }
                using (SqlConnection con = new SqlConnection(DBstring))
                {
                    String         q2  = "SELECT DriverID,Name from Driver where Status = 'Active'";
                    SqlDataAdapter sda = new SqlDataAdapter(q2, con);
                    DataTable      dt2 = new DataTable();
                    sda.Fill(dt2);
                    if (dt2.Columns.Count != 0)
                    {
                        DriverDropDown.DataSource     = dt2;
                        DriverDropDown.DataTextField  = "Name";
                        DriverDropDown.DataValueField = "DriverID";
                        DriverDropDown.DataBind();

                        ListItem LiDriver = new ListItem("Select driver", "-1");
                        DriverDropDown.Items.Insert(0, LiDriver);
                    }
                }
            }
        }