System not supported exception in IAsyncResult

System not supported exception in IAsyncResult

i am trying to use HttpWebRequest for accessing a server. My application used to work on win7 and phone sdk 7.1 but now i upgraded to win8 and phone sdk 8, though my project is still for windows phone 7.1

Getting following exception in IAsyncResult.ASyncWaitHandle

base = {System.NotSupportedException: Specified method is not supported.    at System.Net.Browser.OHWRAsyncResult.get_AsyncWaitHandle()} 

Answers & Comments...

Answer: 1

Await/Async isn't compatible with WP7 or WP7.1

it's a new .Net 4.5 feature and not usable for these projects (which are basically Silverlight 3/4 projects).

by : Faster Solutionshttp://stackoverflow.com/users/890018

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