How to serialize the Complex Type of EntityFramework

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ASP.NET

MVC

Hi all

Requirement is like i wanted to send the result of a MVC web api to client side via some js code. But the Get api is returning a list of complex type.

public class WhitepapersController : ApiController
{
// GET /whitepapers
[WebApiOutputCache(120, 60, false)]
public IQueryable<filteredwhitepaperlist_result> Get()
{
using (var rep = new WhitepaperRepository())
{
var lstWp = rep.GetPagedFilteredWhitepapers(1, 20, "newest"); // this return list of Complex type "FilteredWhitepaperList_Result"
return lstWp.AsQueryable();
}
}

The error stated like:
Complex type cannot be serialized to JSON because its IsReference setting is 'True'. The JSON format does not support references because there is no standardized format for representing references. To enable serialization, disable the IsReference setting on the type or an appropriate parent class of the type.
at System.Runtime.Serialization.Json.DataContractJsonSerializer.CheckIfTypeIsReference(DataContract dataContract)
at System.Runtime.Serialization.Json.XmlObjectSerializerWriteContextComplexJson.GetDataContract(Int32 id, RuntimeTypeHandle typeHandle)


Somebody having something on this?

Please help

Thanks.