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Running report prevents callbacks

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Steele asked on 30 Aug 2011, 07:14 AM

Hi All,
I am using telerik webform report viewer version 5.1.11.713 and the corresponding Reporting dll's.
I am having issues with enabling a user to close down a report and continue using the ajaxified web application.
I use the radwindow to load an aspx page that contains the web viewer. In the Page_Load event, I assign my report document to it.
Some reports may take a couple of minutes to run, and the user may close the radwindow in order to do another task. It would be expected that the user not receive the report.
The thing is, if the user clicks a button that uses a callback, that callback waits until the Report has completed.
This is unexpected.
Is this the intent of the Report mechanism? Elsewhere, if a callback is triggered while another callback is being processed, the new callback takes precedence.
Can you please advise as to what can be done to alleviate this issue?
Thanks,
Steele.

My ReportHolder page :

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ReportHolder.aspx.cs" Inherits="Audit.Audit_Reports.ReportHolder" %>

<%@ Register assembly="Telerik.ReportViewer.WebForms, Version=5.1.11.713, Culture=neutral, PublicKeyToken=a9d7983dfcc261be" namespace="Telerik.ReportViewer.WebForms" tagprefix="telerikrv" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title>Report Holder</title>

<style type="text/css">

html, body, form#form1, div#Content

{

margin: 0px;

padding: 0px;

height: 100%;

}

</style>

</head>

<body >

<form id="form1" runat="server">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

</telerik:RadScriptManager>

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server"

UpdatePanelsRenderMode="Inline">

<AjaxSettings>

<telerik:AjaxSetting AjaxControlID="ReportViewer1">

<UpdatedControls>

<telerik:AjaxUpdatedControl ControlID="ReportViewer1" />

</UpdatedControls>

</telerik:AjaxSetting>

</AjaxSettings>

</telerik:RadAjaxManager>

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">

<script type="text/javascript">

</script>

</telerik:RadCodeBlock>

<telerik:RadSplitter

ID="RadSplitter1" runat="server" Height="100%" Width="100%">

<telerik:RadPane ID="RadPane1" Runat="server" Scrolling="None"

onclientresized="ResizeViewer">

<div id="Content">

<telerikrv:ReportViewer ID="ReportViewer1" runat="server" Height="100%"

Width="100%" ShowHistoryButtons="False" ShowParametersButton="False">

</telerikrv:ReportViewer>

</div>

</telerik:RadPane>

</telerik:RadSplitter>

</form>

</body>

</html>

And my code behind :

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Audit.Audit_Reports

{

public partial class ReportHolder : System.Web.UI.Page

{

private Telerik.Reporting.IReportDocument Get_Report(string RepName)

{

try

{

Type t = Type.GetType("Audit.Audit_Reports." + RepName);

Telerik.Reporting.IReportDocument ret = (Telerik.Reporting.IReportDocument)(Activator.CreateInstance(t));

foreach (string QRKey in Request.QueryString.Keys)

{

if (QRKey != "Report")

{

// Is a parameter to set

Telerik.Reporting.Report rep = (Telerik.Reporting.Report)ret;

if (rep.ReportParameters.Contains(QRKey))

{

rep.ReportParameters[QRKey].Value = Request.QueryString[QRKey];

}

return ret;

}

catch (Exception oE)

{

return null;

}

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

Telerik.Reporting.IReportDocument rd = Get_Report(Request.QueryString["Report"]);

if (rd != null)

{

ReportViewer1.Report = rd;

this.Title = rd.DocumentName;

ReportViewer1.ShowParametersButton = true;

}

5 Answers, 1 is accepted

answered on 01 Sep 2011, 04:18 PM

Hi Steele,

The experienced behavior is due to the ASP.NET Session implementation. ASP.NET Session state blocks other requests with the same session ID. You may find it useful to check the Weird problem with session state and callbacks ASP.NET forum thread for more information.

If you don't need to use the Session in the initial page then our suggestion is to disable it with a page directive as shown in the following snippet:

Copy Code

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="MainPage.aspx.cs" Inherits="TestTelerikWebApp.ReportCancel.MainPage" EnableSessionState="False" %>

Hope this helps.

Greetings,
Peter
the Telerik team

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answered on 05 Sep 2011, 08:51 PM

Hello Steele,

The web report viewer relies on the Session to pass information about the report through it to the http handler that serves its requests/operations. As long as the viewer uses the Session to store information and the asp.net framework serializes the requests with the same SessionID (it should be the same session, otherwise the information will be lost) we do not see any possible workaround for your requirement.

The only way to solve the issue according to us is to make the viewer work without using the asp.net Session. This, however, will require a major rework of the viewer and an implementation of an external storage for the report data which is not an easy task. Still, we are considering to make this change for a future release.

Regards,
Chavdar
the Telerik team