How to access sharepoint 2010 data into normal desktop based asp.net application

Hi,

SharePoint 2010 provides REST based WCF Data Services to expose SharePoint data to third party applications.

Please take a look at the following links.

Accessing SharePoint 2010 Lists by Using WCF Data Services

Access sharepoint list from web site hosted externally from sharepoint

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Microsoft MVP - ASP/ASP.NET