Telerik Reporting ASP.Net WebForms and HTML5 viewers rely on the client(browser)'s PDF plugin to print the report. This operation cannot be started without the user confirmation at the client.
. Details how to wrap a TRDX file for further processing are available in How to: Deploy a report created with Standalone Report Designer
In case you need to print the report on the server
, you can use the ReportProcessor.PrintReport method with properly set printer settings to avoid popups on the server - Hide the print progress dialog when printing a report programmatically
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