Why cant set maxAllowedContentLength in web config using vs2012 ?

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ASP.NET

WebConfig

Hi I am developing website using vs2012,and in that i will upoload maximium size file so i set

<requestLimits maxQueryString="90000" maxAllowedContentLength="-1073741824" />

in web config.If i run website in vs2012 i get this error like

Config Error
   The 'maxAllowedContentLength' attribute is invalid. Not a valid unsigned integer

and my config setting is

<requestFiltering allowDoubleEscaping="true">
    <requestLimits maxQueryString="90000" maxAllowedContentLength="-1073741824" />
  </requestFiltering>

But if i set same line in vs2010 then it work,it didnt send any error mag.i am get same error here mention like
http://stackoverflow.com/questions/4022434/how-to-set-the-maxallowedcontentlength-to-500mb-while-running-on-iis7[^]

And i check Request Filtering form turn windows on/off form control panel same like here mention http://www.iis.net/configreference/system.webserver/security/requestfiltering/requestlimits[^]


Note :I am use vs2012,win 8 64 bit


Regards
Aravind