__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

For me "__doPostBack" did not work in all pages because I compiled my project with newer version of Visual stdio then I double clicked on properties in solution explorer and changed "Target framework " from .Net framework 4.0 to .Net framework 3.0 and after that rebuild project and it worked.