protected void btnInsert_Click(object sender, EventArgs e)
        {
            DBOps db = new DBOps();

            string _key   = txtInsertItem.Text;
            long   _value = long.Parse(txtInsertQuantity.Text);
            string lab    = ddlInsertLab.SelectedValue;

            int retval = db.InsertInventoryTable(_key, "", _value, lab, "", "");

            lblInsertInfo.Text = retval.ToString() + " row inserted";
            lblInsertInfo.DataBind();

            RefreshTable();
        }