asp.net - PageRequestManager not populating 'args._postBackElement' parameter -


when using asp.net updatepanel , causing postback while previous postback still in-progress, default action cancel first , allow second take over.

i've built mechanism opposite: leave first , cancel subsequent requests come same initiating control.

this working on machine. however, doesn't work on colleague's machine or our staging server.

the crucial part of problem this: when pagerequestmanager.initializerequest event fired, args parameter on machine contains populated _postbackelement object, whereas on other machines property null.

as far can see, else same - markup/code triggers request, <asp:scriptmanager /> declaration, web.config...

so why pagerequestmanager on other machines not populating property, yet on machine does populate property?


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