.net - Webforms ScriptResource.axd ArgumentTypeException - Ajax -

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using .net 4.5, have set of controls contained within updatepanel. 1 of these controls drop down partial page postback.

if enter form , click submit button outside of updatepanel , select item in drop down within updatepanel, im getting js error scriptresource.axd

sys>argumenttypeexceltion: object of type object cannot converted type string. parameter name value.

the server side postback event on drop down not fired

in case, due form containing hidden field id of "action"


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