I am trying to download multiple files from gridView by selecting checkbox( on SharePoint site), Actually it will fetch the file using SharePoint ID from list in the SharePoint site and write it my documents folder and then zip it. all the functionalities working in development server, I am able to download as zip file in the my documents folder in the system. Note: The same code deployed to QA environment, I tried to download it, but I am getting the 403 forbidden error. I could not able to download it. Could someone please help me on this issue.