Any example of Datatable using ASP.Net Entity Framework + JSON

Hi All,

I'm bit familiar with datatables (the fantastic plugin) but not really hands on how to use it with ASP.Net entity framework. I need to implement it with the following structure:
ASP.Net web page calls webservice
webservice returns data in JSON format
all should be using Entity Framework

If anyone has any example ready, please share. It'll be a great help.

Thanks
sonofspm