You may use the ReportProcessor class to export the report and return it as a file attachment.
I suggest you to take a look at Print a report directly at client-side without displaying it in a Viewer
Note that you cannot export a singe Data Item
- it should be included in a Report.
You might also find Exporting a report to PDF programmatically
KB article helpful.
Our MVC demo which can be found at C:\Program Files (x86)\Progress\Telerik Reporting[Version]\Examples\CSharp\MvcDemo
may also be useful.
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