private void btnSubmit_Click(object sender, System.EventArgs e)
        {
            BidSys.Item obj = new BidSys.Item();
            string strStatus;

            strStatus = obj.AddItem(txtItemName.Text,
                                    txtItemDesc.Text,
                                    Convert.ToDouble(txtAskPrice.Text),
                                    Convert.ToDouble(txtNotifyPrice.Text),
                                    Convert.ToInt32(Request.Cookies["PersonID"].Value),
                                    Convert.ToDateTime(txtExpDate.Text));

            try
            {
                Int32.Parse(strStatus);
                Response.Redirect("MenuForRegisteredUsers.aspx");
            }
            catch (FormatException ex)
            {
                lblMsg.Text = "Error while adding the item. Please try again." + strStatus;
            }
        }
为什么编译的时候提示申明了变流ex，但从未使用过？？
谢谢