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Retrieve items from External Lists in SharePoint 2010

I was looking to get some items from an external List programmatically. I made the simple code as used with sharepoint list. But, an exception was fired => "Access denied".

After googling, i found that i didn't create the context object that allows the call to the external sevice. Here is the code :

SPServiceContext context = SPServiceContext.GetContext(mySite);
SPServiceContextScope contextScope = new SPServiceContextScope(context);

//.. add your  code to retrieve items as used with sharepoint lists

Here is some code snippet for using External lists :   http://msdn.microsoft.com/en-us/library/ff464347.aspx
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