Hi @hakan topcu ,
I have to suggest that you use English to consult in this forum, which may get more expert support.
The Report Viewer control can be used to integrate Reporting Services RDL reports into WebForms and WinForms applications. It is mainly used to view reports. If you need to design a new report, please download "Report Designer" and "Reporting Service Projects" from the Extensions on the toolbar at the top of VS.
For more information on designing reports, please refer to : Create a Report Server Project (Reporting Services).
Best Regards,
Joy
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