crystal report toolbar button not working

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ASP.NET

CrystalReports

crystal report toolbar problem
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when i click next page in my report and i am sure that there is another page
this message appear and there is not any page appear message

"please wait while document processed"

and this occur on all toolbar button


image

this is code in page load

<pre> protected void Page_Load(object sender, EventArgs e)
    {


        Title = "عرض التقارير";
        if (Session["UserCode"] == null) Response.Redirect("~/Login.aspx");


        if (Request.QueryString["id"] != null)
        {
            oReport = new Cls_Report();
            oReportDocument = new ReportDocument();

            if (!Session["Condition"].Equals(null))
            {
                oReport.Condition = Session["Condition"].ToString();
                Session.Remove("Condition");
            }
            switch (Request.QueryString["id"])
            {
                    
                case "1":
                    oReportDocument.Load(Server.MapPath("~/reports/ar1.rpt"));
                    oReportDocument.SetDataSource(oReport.ReportAllEmployees(false));
                    break;

                case "2":
                    oReportDocument.Load(Server.MapPath("~/reports/ar2.rpt"));
                    oReportDocument.SetDataSource(oReport.ReportAlljpbs());
                    break;

                case "1order":
                    oReportDocument.Load(Server.MapPath("~/reports/ar1.rpt"));
                    oReportDocument.SetDataSource(oReport.ReportAllEmployees(true));
                    break;
                case "3":
                    oReportDocument.Load(Server.MapPath("~/reports/ar3.rpt"));
                    oReportDocument.SetDataSource(oReport.ReportAlljudges());
                    break;
                case "4":
                    oReportDocument.Load(Server.MapPath("~/reports/ar4.rpt"));
                    oReportDocument.SetDataSource(oReport.ReportAlljudgesindestrict());
                    break;

                case "5":
                    oReportDocument.Load(Server.MapPath("~/reports/ar5.rpt"));
                    oReportDocument.SetDataSource(oReport.ReportAlljudgesRank());
                    break;

            }
            ReportViewer.ReportSource = oReportDocument;
            
        }


    }</pre>