ASP.Net Web API showing correctly in VS but giving HTTP500

Question

after a lot of help yesterday, I came up against a known error in asp.net4 beta - I upgraded to VS2012 RC Express (4.5), and now I\'m getting an internal server error, and I

Answer 1

I guess you are getting an exception at serialization due to lazy loading of the entities.

This thread may help you.

UPDATE:

Try if this working or not and if yes then the issue is mostly what I said

public IList GettblCustomerBookings()
{
    var custBookings = db.tblCustomerBookings.Include("tblRentals").AsEnumerable();

    return custBookings
               .Select(c => new tblCustomerBooking
                            { 
                               customer_id = c.customer_id,
                               customer_name = c.customer_name,
                               customer_email = c.customer_email,
                               tblRentals = c.tblRentals
                                               .Select(r => new tblRentals
                                                      {
                                                          rental_id = r.rental_id,
                                                          // other props exclude the 
                                                          // tblCustomerBooking 
                                                      })
                            }
                      ).ToList();
}

I guess if you are using JSON.NET library with web api you can easily control the properties that don't need to be serialized by specifying the [JsonIgnore] attribute and there by you can avoid writing the above LINQ query.

http://code.msdn.microsoft.com/Using-JSONNET-with-ASPNET-b2423706

http://james.newtonking.com/archive/2009/10/23/efficient-json-with-json-net-reducing-serialized-json-size.aspx