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Editorial Team
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Asked: 2026-05-27T15:47:30+00:00

While trying to access the contacts in Windows phone as detailed in this official

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While trying to access the contacts in Windows phone as detailed in this official doc here, I receive the following error:

Error   1   The type or namespace name 'UserData' does not exist in the namespace 'Microsoft.Phone' (are you missing an assembly reference?)    C:\Users\XXX\Documents\Visual Studio 
2010\Projects\WindowsPhoneDataBoundApplication1\WindowsPhoneDataBoundApplication1\NewSched.xaml.cs  13  23  WindowsPhoneDataBoundApplication1

Specifically the problem is solved when i remove this statement:

using Microsoft.Phone.UserData;

I need that library so that I can access the phone’s contacts. How can this be resolved?

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1 Answer

  1. Editorial Team

    The problem was caused by running the Windows 7.0 SDK. Not the one for 7.1. Installing the Windows Phone 7.1 SDK resolved the issue.

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