private void CB_RobotCount_SelectedIndexChanged(object sender, EventArgs e)
 {
     string[] ConveryName = db.GetConveyorName(CB_RobotIndex.SelectedIndex + 1);
     CB_Conveyor.Items.Clear();
     if (ConveryName != null)
     {
         CB_Conveyor.Items.AddRange(ConveryName);
     }
 }