make Excel using Database

protected void ConnectionXML()

    {

        string constr = ConfigurationManager.ConnectionStrings["MyconPinUp"].ConnectionString;

        using (SqlConnection con = new SqlConnection(constr))

        {

            string cmdget = " select  b.recr_id,a.email_id, a.mob1, a.user_id,b.job_id,rtrim((rtrim(a.first_name+' '+isnull(a.last_name,'')))) as name," +

                               " a.pref_locality,c.locality_name+' , '+d.city_name as locality_name," +

                               " b.subject_id,e.subject_name,a.total_exp_years,a.total_exp_months,b.applied_on " +

                               " from user_profile a,job_applied b,locality_master c, city_master d ,profile_subj_master e" +

                               " where " +

                               " a.org_id=b.org_id and a.user_id=b.user_id " +

                               " and a.org_id=c.org_id and a.pref_locality=c.locality_id" +

                               " and c.org_id=d.org_id and c.city_id=d.city_id " +

                               " and b.org_id=e.org_id and b.subject_id=e.subject_id " +

                               " and isnull(b.applied,'N')='Y'" +

                " and b.recr_id='" + hnfRecrId.Value + "'" +

                // " and a.user_id in ('U000040','U000011','U000012','U000008','U000001')";

                               " and a.user_id in (" + hdn_User_Ids.Value + ")";

            using (SqlCommand cmd = new SqlCommand(cmdget))

            {

                using (SqlDataAdapter sda = new SqlDataAdapter())

                {

                    cmd.Connection = con;

                    sda.SelectCommand = cmd;

                    using (DataTable dt = new DataTable())

                    {

                        sda.Fill(dt);

                        using (XLWorkbook wb = new XLWorkbook())

                        {

                            wb.Worksheets.Add(dt, "Condidates");

                            Response.Clear();

                            Response.Buffer = true;

                            Response.Charset = "";

                            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

                            Response.AddHeader("content-disposition", "attachment;filename=SqlExport.xlsx");

                            using (MemoryStream MyMemoryStream = new MemoryStream())

                            {

                                wb.SaveAs(MyMemoryStream);

                                MyMemoryStream.WriteTo(Response.OutputStream);

                                Response.Flush();

                                Response.End();

                            }

                        }

                    }

                }

            }

            HttpContext.Current.Response.Clear();

            HttpContext.Current.Response.End();

        }

    }