InventoryController.UpdateInventory C# (CSharp) Method

    public void UpdateInventory()
    {
        var items = GameObject.FindGameObjectsWithTag("InventoryItem");
        foreach (var item in items)
        {
            Destroy(item);
        }
        for (var i = 0; i < Statics.Inventory.Count; ++i)
        {
            var itemInfo = Statics.Inventory[i];
            var newItem = Instantiate(InventoryItemTemplate);
            newItem.transform.SetParent(transform, false);

            var itemController = newItem.GetComponent<InventoryItemController>();
            if (itemController == null)
                throw new ArgumentException("InventoryItemTemplate does not contain an InventoryItemController");

            itemController.SetItem(itemInfo.ItemID);
            itemController.SetPosition(i);
        }
    }

        protected void cmdUpdate_Click(object sender, EventArgs e)
        {
            try
            {
                InventoryController controller = new InventoryController();
                InventoryInfo       item       = new InventoryInfo();

                item.Content       = txtContent.Text;
                item.ItemId        = itemId;
                item.ModuleId      = this.ModuleId;
                item.CreatedByUser = this.UserId;

                //determine if we are adding or updating
                if (Null.IsNull(item.ItemId))
                {
                    controller.AddInventory(item);
                }
                else
                {
                    controller.UpdateInventory(item);
                }

                Response.Redirect(Globals.NavigateURL(), true);
            }
            catch (Exception ex)
            {
                Exceptions.ProcessModuleLoadException(this, ex);
            }
        }