New to Telerik Reporting? Download free 30-day trial

The Old ASP.NET Webforms ReportViewer Malfunctions When ClientIDMode Is Static


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


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 old ASP.NET Webforms ReportViewer malfunctions when its ClientIDMode is set to Static.


The old ASP.NET WebForms ReportViewer has a complex structure and its functionality partially depends on the JavaScript delivered by its HTTP handlers. Setting the ClientIDMode to Static may lead to improper execution of these JavaScript methods.


To solve this issue, refer to the solutions suggested in the ClientIDMode in ASP.NET 4.0 Web Log blog post by Rick Strahl.

In this article