Exporting and save in folder RadHtmlChart to PDF - RadHtmlChart - UI

Question

I'm using RadHtmlChart and I want to save the chart to App_data/Export/ But it is not working. It exports to PDF, but it's not able to save to a local folder.

var relativePath = "~/App_Data/Export/";

RadClientExportManager1.PdfSettings.ProxyURL = ResolveUrl(relativePath);
RadClientExportManager1.PdfSettings.FileName = "test123.pdf";