I came across few posts of past where it has been said that Passing the DataSource of the report from Silverlight to the ReportingService is not possible.
As its been talk of more than a year back, I am wondering if it is possible now? If yes then how ?
AFAIK nothing has changed, the reports reside on the server and the only way to pass data to the report is this: http://www.telerik.com/support/kb/reporting/report-viewers/programmatic-initialization-of-report-parameter-values-in-telerik-reporting-silverlight-viewer.aspx.
If you want to play along, you can bind your report programmatically in NeedDataSource and based on the parameter values, change the data or even build your data source ..