面板弹出需要更多的时间来关闭点击面板中的关闭按钮

 public void productcode_Click(object sender, EventArgs e)
        {
            pnlpopup.Visible = true;
            //UpdatePanel3.Update();
            //this.UpdatePanel3.Update();
            GridViewRow clickedRow = ((LinkButton)sender).NamingContainer as GridViewRow;
            LinkButton lbtn = (LinkButton)clickedRow.FindControl("productcode");
            string customer = clickedRow.Cells[0].Text.ToString();
            string manufacturer = clickedRow.Cells[5].Text.ToString();
            string salesperson = clickedRow.Cells[6].Text.ToString();
            System.Data.DataTable newProductTable = null;
            ArrayList productDrilldownList = new ArrayList();
            productDrilldownList.Add(customer);
            productDrilldownList.Add(manufacturer);
            productDrilldownList.Add(lbtn.Text);
            productDrilldownList.Add(salesperson);

            try
            {
                ViewData1 vData = new ViewData1();
                DataSet ds1 = vData.__getProdOverviewDataSet(__getConnectionString());
                DataSet ds2 = vData.__getCustOverviewDataSet(__getConnectionString());
                DataSet ds3 = vData.__getSalesOverviewDataSet(__getConnectionString());
                DataSet ds4 = vData.__getManOverviewDataSet(__getConnectionString());
                DataSet ds5 = vData.__getBookedDateDataSet(__getConnectionString());
                List<DateTime> booked_date = new List<DateTime>();
                if (ds5.Tables[0].Rows.Count > 0)
                {
                    foreach (DataRow row in ds5.Tables[0].Rows)
                    {
                        if (row[0].ToString() != " " && row[0] != null)
                        {
                            booked_date.Add(Convert.ToDateTime(row[0]));
                        }
                    }
                }
                booked_date.Remove(Convert.ToDateTime("1/1/0001 12:00:00 AM"));
                booked_date.Sort();
                ArrayList daterange = new ArrayList();
                daterange = _getDateRange();
                if (Convert.ToDateTime(daterange[0]) > Convert.ToDateTime(daterange[1]))
                {
                 //   DataGrid1.Visible = false;
                 //   Label4.Visible = false;
                //    TxtCustProd.Visible = false;
                //    Panel1.Visible = false;
                //    ClientScript.RegisterClientScriptBlock(GetType(), "Javascript", "<script>alert('There is no data found')</script>");
                //    return;
                }
                if (ToDateTxtBox.Text != "" && ToDateTxtBox.Text != "To Date" && FromDateTxtBox.Text != "From Date")
                {
                    DropDownList2.Text = "Months";
                    DropDownList3.Text = "Years";
                    if (!booked_date.Contains(Convert.ToDateTime(daterange[2])) && !booked_date.Contains(Convert.ToDateTime(daterange[3])))
                    {
                     //   DataGrid1.Visible = false;
                     //   Label4.Visible = false;
                    //    TxtCustProd.Visible = false;
                    //    Panel1.Visible = false;
                    //    ClientScript.RegisterClientScriptBlock(GetType(), "Javascript", "<script>alert('There is no data found')</script>");
                    }
                }
                else
                {
                    ToDateTxtBox.Text = "";
                    FromDateTxtBox.Text = "";
                }


                int countCustomer = -1;
                int countProduct = -1;
                int countSales = -1;
                int countMan = -1;
                if (ds1.Tables[0].Rows.Count > 0)
                {
                    countProduct = ds1.Tables[0].Rows.Count;
                }
                if (ds2.Tables[0].Rows.Count > 0)
                {
                    countCustomer = ds2.Tables[0].Rows.Count;
                }
                if (ds3.Tables[0].Rows.Count > 0)
                {
                    countSales = ds3.Tables[0].Rows.Count;
                }
                if (ds4.Tables[0].Rows.Count > 0)
                {
                    countMan = ds4.Tables[0].Rows.Count;
                }

                System.Data.DataTable dt = new System.Data.DataTable();
                string test = "";
                if(Session["callcount"] != null){
                    string coo = Session["callcount"].ToString(); 
                    int coi = Int16.Parse(coo);
                    Session["callcount"] = coi + 1;
                    test = Session["callcount"].ToString();
                }
                else{
                    int coi = 0;
                    Session["callcount"] = coi.ToString();
                    test = Session["callcount"].ToString();
                }
                dt = vData.__getProductLevelSource(__getConnectionString(), __getDropDownValues(), __getProdFilterValues(), __getCustFilterValues(), __getSalesFilterValues(), __getManFilterValues(), countCustomer, countProduct, countSales, countMan, _getDateRange(), __getProdFamilyFilterValues(), productDrilldownList);
                GridView1.DataSource = dt;
                GridView1.DataBind();
                //dt.Rows.Count
                Gridview_Columnshide(GridView1);
            }
            catch (Exception dateerr)
            {
                //DataGrid1.Visible = false;
                //Label4.Visible = false;
                //TxtCustProd.Visible = false;
                //Panel1.Visible = false;
                //ClientScript.RegisterClientScriptBlock(GetType(), "Javascript", "<script>alert('There is no data found')</script>");
            }
            ModalPopupExtender1.Show();
            //UpdatePanel3.Update();
        }