Enable Add reference with option "Generate Asynchronous Operations" for Silverlight 5 (with Async Targeting Pack)
Since async will be supported in SL5 and .NEt 4 through Async Targeting Pack, it would be excelent to enable the usage of async/await on SL5 WCF client proxies. The option "Generate Asynchronous Operations" is currently disabled in SL5 "Add Service Reference" dialog.
Please, make it happen before the VS12 RTM
Thank you for your feedback. While Microsoft continues to support Silverlight, and remains committed to doing so into 2021, there will be no new development work except security fixes and high-priority reliability fixes. You can read our recommendations and support policy on this UserVoice response: https://visualstudio.uservoice.com/forums/121579-visual-studio-2015/suggestions/3556619-silverlight-6.
For anybody still interested in Silverlight and Task based async WCF it might be worth taking a look at this project:
Despite its name, version 3 adds support for Task based async model.
I have been using v2 for years without any issue.
I hope it helps!