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Home/ Questions/Q 6776599
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T16:02:54+00:00 2026-05-26T16:02:54+00:00

I am making an WP7 app that connects to SQL DB through WCF. But

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I am making an WP7 app that connects to SQL DB through WCF. But after adding the client proxy and testing it, I got this error.

The type or namespace name IExtensibleDataObject does not exist in the namespace System.Runtime.Serialization (are you missing an assembly reference?)

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  1. Editorial Team
    Editorial Team
    2026-05-26T16:02:55+00:00Added an answer on May 26, 2026 at 4:02 pm

    Apparently (and according to this blog), the .NET Compact Framework used by WP7 does not expose IExtensibleDataObject in the System.Runtime.Serialization namespace.

    An alternative is to use the Silverlight Service Model Proxy Generation Tool to generate the client proxy. The resulting code should work on WP7.

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