How to get Windows Server Active Directory users data in Windows Phone 7 Series (windows mobile 7)?

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.NET3.0

C#

ASP.NET

.NET

How to get windows server active directory users data into windows phone 7 series.which namespace we use to conect Active directory.
in web or windows application we can use System.DirectorySerices namespace.

Using web service or wcf we can find a solution for this, but we can maintain a seperate web server for web service or wcf service.

if you found any solution please post it.