I am hosting a WCF service in IIS using basicHttpBinding. The WCF web services queries back end SQL Server 2008 by using ADO.Net and return a DataTable to client side of WCF
Maybe will be helpful for someone.
I had the same error. It was solved by setting MaxItemsInObjectGraph property (to big value) in server-side web.config:
got it from here: http://forums.asp.net/post/4948029.aspx