private void FillcboUnits()
 {
     string[] objList = ReturnableDCItemManager.GetUnits();
     if (objList != null)
     {
         foreach (string str in objList)
         {
             cboUnit.Items.Add(str);
         }
     }
 }
        private void FillcboItems()
        {
            string[] ItemList = ReturnableDCItemManager.GetItems();

            cboItemCode.Items.Clear();
            if (ItemList != null)
            {
                foreach (string str in ItemList)
                {
                    cboItemCode.Items.Add(str);
                }
            }
        }