The connection string is part of the report definition. Via requests to the API you can pass only the report ID, parameter values, and rendering configuration. More information can be found in the Reporting REST Service API Reference
. This applies to both Telerik Reporting and Telerik Report Server, since the latter hosts the Reporting REST service and uses it to render reports for preview purposes.
windows service is used only for Scheduled Tasks and Data Alerts. The REST service does not communicate with the windows service directly.
Using the Report Server API
you can create a Scheduled Task. This task will be executed according to the configured scheduled task plan and an e-mail will be sent including the rendered PDF document. More information is available in the Scheduled Tasks Management
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