c# - Crystal not show in crystal report viewer -

i'm trying show crystal report website. can print report don't understand why when want show data in crystal report viewer why it's not showing. research in website, use crystalreportviewer1.refresh() can not use it, says

error 1 'crystaldecisions.web.crystalreportviewer' not contain definition 'refresh' , no extension method 'refresh' accepting first argument of type 'crystaldecisions.web.crystalreportviewer' found (are missing using directive or assembly reference?) d:\generateqr\generateqr\default.aspx.cs 115 38 generateqr

this code

if (dtqr.rows.count > 0) {             string dirprint = @"d:\generateqr\generateqr\report\qreport.rpt";             //cr = new reportdocument();             //cr.printoptions.papersize = crystaldecisions.shared.papersize.papera4;             //cr.load(dirprint);             ////cr.printoptions.printername = @"\\10.4.201.89\scx-5635";             //cr.setdatasource(dtqr);             //crystalreportviewer1.reportsource = cr;              //cr.exporttodisk(crystaldecisions.shared.exportformattype.portabledocformat, @"d:\asd.pdf");             ////cr.printtoprinter(1, false, 0, 0);             cr = new reportdocument();             cr.load(dirprint);             cr.setdatasource(dtqr);             crystalreportviewer1.reportsource = cr;             crystalreportviewer1.refresh();          } 

this code in aspx

<form id="form1" runat="server"> <div>     <cr:crystalreportviewer id="crystalreportviewer1" runat="server" autodatabind="true" />         </div>  </form> 

i looks should

crystalreportviewer1.refreshreport() crystalreportviewer1.reportsource = rpt 

not refresh().