WebForms Reports Do Not Display Data or Applied Changes in Events

Environment

Product	Progress® Telerik® Reporting
Version	Q2 2012 and later
Report Viewers	Legacy ASP.NET WebForms Viewer

Description

The described scenario and suggested solution relate to the legacy ASP.NET WebForms ReportViewer. It is recommended that you migrate to the HTML5 ReportViewer.

The legacy ASP.NET WebForms ReportViewer report does not display data or changes that are made in the events.

Cause

The legacy ASP.NET WebForms ReportViewer depends on the ASP.NET Session.

Solution

Depending on the session state mode of the application, the report may require additional settings as described in the Design Considerations for Out-proc Session State article.