I have written a odata asp.net web api application in which i was returning a single object which was working fine. Now my requirement is to return multiple entities in GET request. While trying to do so i am getting the follwing error

[ArithmeticException]: Overflow or underflow in the arithmetic operation.
[HttpException]: An error occurred while communicating with the remote host. The error code is 0x80070216.
   at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
   at System.Web.Hosting.IIS7WorkerRequest.FlushCore(Boolean keepConnected, Int32 numBodyFragments, IntPtr[] bodyFragments, Int32[] bodyFragmentLengths, Int32[] bodyFragmentTypes)
   at System.Web.Hosting.IIS7WorkerRequest.FlushCachedResponse(Boolean isFinal)
   at System.Web.HttpResponse.UpdateNativeResponse(Boolean sendHeaders)
   at System.Web.HttpRuntime.FinishRequestNotification(IIS7WorkerRequest wr, HttpContext context, RequestNotificationStatus& status)
-->

Controller

using Microsoft.AspNet.OData;
using adaptor.Models;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using System.Web.Http;
using System.Web;
using System;
using System.Collections.Generic;
using Microsoft.AspNet.OData.Routing;
using System.Web.Http.Results;
using System.Xml.Linq;
using System.Net.NetworkInformation;
using System.Reflection;
using Newtonsoft.Json.Linq;
using System.Collections;

namespace Webapplication1.Controllers
{
    public class TableController : ApiController
    {
        TableContext db = new TableContext();

        protected override void Dispose(bool disposing)
        {
            db.Dispose();
            base.Dispose(disposing);
        }

        [ODataRoute("Table")]
        [AcceptVerbs("GET")]
        [HttpGet]
        [EnableQuery(PageSize = 1000)]
        public IHttpActionResult getAll()
        {
            try
            {

                var firstObject = new Table1();
                var secondObject = new Table2();
                var response = new MainModel();
                {
                   response.Table1List = db.Tables1.ToList();
                   response.Table2List = db.Tables2.ToList();
                };
                return Ok(response);
            }
            catch (OverflowException)
            {
                return BadRequest("Arithmetic operation resulted in overflow.");
            }
        }
    }
}

Model class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;

namespace Webapplication1.Models
{
    public class MainModel
    {
        public List<Table1> Table1List { get; set; }
        public List<Table2> Table2List { get; set; }
    }
}

TableContext class

   public DbSet<Table1> Tables1 { get; set; }
    public DbSet<Table2> Tables2 { get; set; }