This operation is not supported in the current context –Excel upload to Silverlight datagrid

Hi,

I have followed all the steps to upload excel into Silverlight datagrid as in this link..

http://www.kunal-chowdhury.com/2010/05/silverlight-4-interoperability-with.html

, but I am getting issue at this step..

dynamic lObjExcel = AutomationFactory.CreateObject("Excel.Application");

As "This operation is not supported in the current context."

Any ideas.

Thanks