This is a legacy report viewer and for new projects our recommendation is to use the latest web forms report viewer - HTML5 Web Forms Report Viewer
The ASP.NET ReportViewer is designed to render Telerik Reports within ASP.NET WebForms projects.
The ASP.NET Report Viewer uses ASP.NET Session and ASP.NET Cache in order to preserve the report instance assigned to its Report property during page postbacks and for some design reasons as well, so Session should be enabled at all times!
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Export: see Rendering Extensions for available export formats.
The ASP.NET ReportViewer control is a composite of standard ASP.NET Web Server controls.
The ASP.NET ReportViewer comes with four predefined skins: Default, WebBlue, Original and Office2007. The ASP.NET ReportViewer control's toolbar is immutable. To build custom UI for the toolbar and work with the rendered report in the viewer, you can use the ASP.NET ReportViewer Client-Side API.
The purpose of the ASP.NET ReportViewer control is to display Telerik Reports and allow the user to interact with them. Reports are processed and rendered on the server. Reports and their content are delivered to the client through the Telerik.ReportViewer.axd handler.
The ASP.NET ReportViewer caches the report data in the session storage when the session state mode is InProc. For that reason, when the data is provided in the NeedDataSource event handler of the report, the event will be raised only the first time the report gets rendered. When the report is requested for the second time, for example for Export or Print from the viewer, the event won't be raised as the report already has data.
The ASP.NET ReportViewer control's content is rendered in IFRAME elements. The report in the viewer is rendered through the IMAGE rendering mechanism based on the Design Considerations for HTML Rendering.