RDLC Report manual export to pdf, image etc - report viewer export to pdf manually

 https://www.c-sharpcorner.com/blogs/rdlc-report-export-on-server

https://www.aspsnippets.com/Articles/2568/Export-RDLC-Report-to-PDF-without-using-ReportViewer-in-ASPNet-with-C-and-VBNet/