Please check the details and the examples in How to Set Report Sources For Report Viewers operating via Telerik Reporting Services.
The WebForms wrapper of the HTML5 Viewer has a client-side report source that can be set in code:
var clientReportSource =
clientReportSource.IdentifierType = IdentifierType.TypeReportSource;
//or <namespace>.<class>, <assembly> e.g. "MyReports.Report1, MyReportsLibrary"
reportViewer1.ReportSource = clientReportSource;
The identifier type specifies if you are working with reports created in Vs Report Designer, or TRDP|TRDX file created by the Standalone Report Designer. If it is a custom identifier, this implies that on the server you are handling manually
the string description of the report (the Identifier).
If you are requesting a report created by the Standalone Report Designer, the Identifier is a relative path to the TRDX|TRDP file that will be searched in the ReportFileResolver of the Reporting REST Service.
If you are requesting a report created by the VS Report Designer, the Identifier is the assembly qualified name of the report class - <namespace>.<report_class>, <assembly_name>
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