client server request send and receive problem

Quote:

Cannot serialize interface System.Collections.Generic.IEnumerable`1[[WebApplication1.ReturnValues, WebApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].
cananybody help mein this issue?

this is my server side code:

C#

<blockquote class="quote"><div class="op">Quote:</div>using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Linq.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Xml;
using System.Xml.Linq;

namespace WebApplication1
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    // [System.Web.Script.Services.ScriptService]
    public class MyWebService : System.Web.Services.WebService
    {
        
        [WebMethod]
        [ScriptMethod(ResponseFormat = ResponseFormat.Xml)]
        public IEnumerable<ReturnValues> MyService(String vinValue)
        {
            LinqSqlDataContext db = new LinqSqlDataContext();
            var reportdata = from f in db.ff
                             from gin db.gg
                             from h in db.hh
                             where f.first== vinValue 
                             select new XElement("flash",
                                 new XElement("first", f.first),
                                 new XElement("second", g.second)
                                 );
            var reportXml = new XElement("FlashList", reportdata);
            reportXml.Save("file.xml");


            string uri = Uri.EscapeUriString(vinValue);
            string url = FormatUrl(uri);
            XDocument xdoc = XDocument.Load(url);

            IEnumerable<ReturnValues> results =
                            from info in xdoc.Descendants("VIN")
                            select new ReturnValues
                            {
                                first= info.Element("first").Value,
                                second= info.Element("second").Value,
                                
                            };

            return results;
        }

        string FormatUrl(string vinVal)
        {
            return "http://localhost:11936/MyWebService.asmx&VIN="+vinVal;
        }        
    }
}

and also another class:

C#

namespace WebApplication1
{
    public class ReturnValues
    {
        public string first{ get; set; }
        public string second{ get; set; }

    }
}

AND in client side

C#

<pre lang="xml"><blockquote class="quote"><div class="op">Quote:</div>namespace FlashListByVinLadan
{
    public partial class MainWindow : Window
    {
        string vinValue;


        public MainWindow()
        {
            InitializeComponent();
        }

        private void FrameLoad_Activated(object sender, EventArgs e)
        {

        }



        private void btnGo_Click(object sender, RoutedEventArgs e)
        {
            localhost.MyWebService w = new localhost.MyWebService();
            IEnumerable<ReturnValues> req = w.MyService(vinValue);
}