__doPostBack is not defined

Question

Im getting that error when try to call a __doPostBack on one of my pages, every page that i have in the project use __doPostBack function but in this particular page im gett

Answer 1

Solution for my Problem: IIS ASP.NET Webforms generates web pages depending on user Agent string

My IIS had no definition for the IE11 browser so it defaulted to a very simple browser profile which doesn't even Support JavaScript.

• short term solution: run browser in compatibility mode.
• medium term solution: Deployment of .Net Framework 4.5.1 which contains IE11 browser profile definitions.

An alternative: set IE11 Browser definiton file