asp.net - Postbacks fail after upgrade from .NET 3.5 to .NET 4.5.1 -



asp.net - Postbacks fail after upgrade from .NET 3.5 to .NET 4.5.1 -

i've searched similar i'm experiencing couple of days no luck. upgraded suite of web forms applications .net 3.5 .net 4.5.1. after cleaning few referencing issues surrounding nuget packages, managed building , running (locally: iis8) much easier expected.

however, 1 time uploaded production server (iis 7.5, windows server 2008 r2), noticed post-backs, whether triggered linkbutton or autopostback on dropdownlist, work intermittently. first load of page, works fine. go page 1 time again min later, click same button, , post-back happens event handler isn't reached. event handlers attached either via onclick or onchange properties or 'handles' clause in code-behind.

one thing find curious when postback happens on link button click event , event handler isn't reached, form reset. suggest viewstate related issue?

again, worked fine when application targeting .net 3.5, , it's targeting 4.5.1 works fine when debugging on local machine (with iis8), running in iis7.5, post-backs huge problem.

any ideas, suggestions appreciated.

asp.net webforms .net-4.5

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