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Could someone help me figure this out? Up until now, my project has been going fine as I added references. Then I needed System.Web.Extensions, which is shown as being checked in my Reference Manager, but is causing the error in the title of this thread.

Screenshot proofs:

enter image description here

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Fired from Amazon.com
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  • See: http://stackoverflow.com/questions/4520569/where-can-i-find-the-assembly-system-web-extensions-dll – Habib May 11 '15 at 14:15
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    Could it be you are Targeting .net 4.5 and this namespace is in .net 4.0 it is obselete in .net 4.5 see here for details: https://msdn.microsoft.com/en-us/library/hh419161%28v=vs.110%29.aspx – David B May 11 '15 at 14:16
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    @Habib In picture, I think OP _already_ found this dll? :) – Soner Gönül May 11 '15 at 14:16
  • Is this the same project you were having reference problems with [last week](http://stackoverflow.com/questions/30111243/am-i-missing-a-reference-is-microsoft-csharp-runtimebinder-binder-not-defined)? – Richard Deeming May 11 '15 at 19:24

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