private void ToggleSelectedAssets()
        {
            foreach (RepeaterItem ri in OrderItemsRepeater.Items)
            {
                switch (ri.ItemType)
                {
                case (ListItemType.Item):
                case (ListItemType.AlternatingItem):

                    HiddenField OrderItemIdHiddenField = (HiddenField)ri.FindControl("OrderItemIdHiddenField");
                    CheckBox    SelectAssetCheckBox    = (CheckBox)ri.FindControl("SelectAssetCheckBox");

                    SelectAssetCheckBox.Checked = AllAssetsSelected;

                    int orderItemId = Convert.ToInt32(OrderItemIdHiddenField.Value);

                    if (SelectAssetCheckBox.Checked)
                    {
                        SelectedOrderItems.AddUpdate(orderItemId);
                    }
                    else
                    {
                        SelectedOrderItems.Remove(orderItemId);
                    }

                    break;
                }
            }
        }
        protected void SelectAssetCheckBox_CheckChanged(object sender, EventArgs e)
        {
            AllAssetsSelected = false;

            CheckBox cb = (CheckBox)sender;

            foreach (RepeaterItem ri in OrderItemsRepeater.Items)
            {
                switch (ri.ItemType)
                {
                case (ListItemType.Item):
                case (ListItemType.AlternatingItem):

                    Control control = ri.FindControl(cb.ID);

                    if (control != null && control.UniqueID == cb.UniqueID)
                    {
                        HiddenField OrderItemIdHiddenField = (HiddenField)ri.FindControl("OrderItemIdHiddenField");
                        DownloadFormatDropDownList DownloadFormatDropDownList1 = (DownloadFormatDropDownList)ri.FindControl("DownloadFormatDropDownList1");
                        AssetImageSizeDropDownList AssetImageSizeDropDownList1 = (AssetImageSizeDropDownList)ri.FindControl("AssetImageSizeDropDownList1");

                        int            orderItemId      = Convert.ToInt32(OrderItemIdHiddenField.Value);
                        int            assetImageSizeId = AssetImageSizeDropDownList1.SelectedId;
                        DownloadFormat downloadFormat   = DownloadFormatDropDownList1.SelectedDownloadFormat;

                        if (cb.Checked)
                        {
                            SelectedOrderItems.AddUpdate(orderItemId, downloadFormat, assetImageSizeId);
                        }
                        else
                        {
                            SelectedOrderItems.Remove(orderItemId);
                        }
                    }

                    break;
                }
            }
        }