[TestMethod]
    public void TestEntityTest()
    {
        var db = new TestDbContext();
        var ent = db.ResupplyForms.SingleOrDefault(e => e.Guid == new Guid("55117161-F3FA-4291-8E9B-A67F3B416097"));
        var json = new JavaScriptSerializer().Serialize(ent);
    }

An exception of type 'System.InvalidOperationException' occurred in System.Web.Extensions.dll but was not handled in user code

Additional information: A circular reference was detected while serializing an object of type 'System.Data.Entity.DynamicProxies.ResupplyForm_13763C1B587B4145B35C75CE2D5394EBED19F93943F42503204F91E0B9B4294D'.

var db = new Rome.Model.Form.TestDbContext();
var ent = db.ResupplyForms.SingleOrDefault(e => e.Guid == new Guid("55117161-F3FA-4291-8E9B-A67F3B416097"));
var json = new JavaScriptSerializer().Serialize(ent).Dump();

{"ResupplyFormID":1,"Guid":"55117161-f3fa-4291-8e9b-a67f3b416097","RecordStatus":null}