Handling File Downloads from ASP.NET UpdatePanel Using PostBackTrigger
When triggering file downloads (e.g., Excel exports) from controls inside an UpdatePanel, standard asynchronous postbacks fail because the response stream cannot be modified mid-async request. The solution is to force a full postback for the download button using PostBackTrigger.
1. Configure PostBackTrigger in ASPX
Place the <Triggers> s ...
Posted on Thu, 11 Jun 2026 16:34:46 +0000 by Vizzini