download all files from a folder containing multiple files

For that you need a ZIP functionality. Means, collects all files inside a folder and append those to ZIP. Then download the ZIP file finally. Have a look below links that may help you:

 

https://www.aspsnippets.com/Articles/Download-multiple-files-as-Zip-Archive-File-in-ASPNet-using-C-and-VBNet.aspx

 

https://www.mikesdotnetting.com/article/286/downloading-multiple-files-in-asp-net

 

https://plus.google.com/113686425657086558801/posts/Jtz4GYy9MVn

 

http://www.aspdotnet-suresh.com/2013/04/aspnet-download-multiple-files-as-zip.html