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Editorial Team
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Editorial Team
Asked: June 9, 20262026-06-09T21:00:24+00:00 2026-06-09T21:00:24+00:00

I’ve just installed final version of .NET Framework 4.5 and rebooted. I’m using VS

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I’ve just installed final version of .NET Framework 4.5 and rebooted. I’m using VS 2010.
I’ve tried to use new System.Threading.Volatile class but I receive “Cannot resolve symbol” error when using System.Threading.Volatile.

In project properties target framework version is “.NET Framework 4” which I suppose includes 4.5

Why I can’t refer System.Threading.Volatile and how to resolve my problem? Have I to use VS 2012 for that?

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  1. Editorial Team
    Editorial Team
    2026-06-09T21:00:26+00:00Added an answer on June 9, 2026 at 9:00 pm

    You can’t use .NET 4.5 from Visual Studio 2010. You need to install VS 2012 to target .NET 4.5 and use new types defined only in 4.5.

    In project properties target framework version is “.NET Framework 4” which I suppose includes 4.5

    No, it does not. It only includes classes and types in .NET 4. You need to target “.NET Framework 4.5”, which requires VS 2012.

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