protected void bt_BathApprove_Click(object sender, EventArgs e)
    {
        string ids = "";

        foreach (GridViewRow gr in gv_List.Rows)
        {
            if (((CheckBox)gr.FindControl("chk_ID")).Checked == true)
            {
                ids += gv_List.DataKeys[gr.RowIndex]["SVM_Inventory_ID"].ToString() + ",";
            }
        }
        SVM_InventoryBLL.BatApprove(ids, (int)Session["UserID"]);
        BindGrid();
    }