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Asked: 2026-05-27T00:39:55+00:00

I cannot seem to find the JavaScriptSerializer object nor the the System.Web.Script.Serialization namespace within

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I cannot seem to find the JavaScriptSerializer object nor the the System.Web.Script.Serialization namespace within Visual Studio 2010. I need to serialize something to JSON what am I supposed to use?

And yes, I already included the System.Web.Extensions (in System.Web.Extensions.dll) within the project. Which is why I am shocked?

  • I do know System.Web.Extensions was marked as obsolete in 3.5
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1 Answer

  1. Editorial Team

    Check if you included the .net 4 version of System.Web.Extensions – there’s a 3.5 version as well, but I don’t think that one works.

    These steps work for me:

    1. Create a new console application
    2. Change the target to .net 4 instead of Client Profile
    3. Add a reference to System.Web.Extensions (4.0)
    4. Have access to JavaScriptSerializer in Program.cs now 🙂
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