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Home/ Questions/Q 682419
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T01:35:37+00:00 2026-05-14T01:35:37+00:00

During a Mix10 presentation , the presenter (Charlie Kindel) said that when writing Silverlight

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During a Mix10 presentation, the presenter (Charlie Kindel) said that when writing Silverlight based apps for WP7 you get all of Silverlight 3.0 with some of Silverlight 4.0 mixed in.

Why then is System.Json missing? It was included in Silverlight 3.0, and is included in Silverlight 4.0.

Windows Phone 7 Class Library Reference

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  1. Editorial Team
    Editorial Team
    2026-05-14T01:35:37+00:00Added an answer on May 14, 2026 at 1:35 am

    I’m not sure why either , but it says on this link that the namespace is not supported

    See Features Supported in Silverlight for Windows Phone.

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