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[ServiceContract]
public interface IService
{
    [OperationContract]
    [WebGet(UriTemplate = "ClientAccessPolicy.xml")]
    Message ProvidePolicyFile();
}

public class Service : IService
{
    public System.ServiceModel.Channels.Message ProvidePolicyFile()
    {
        return 
            Message.CreateMessage
            (
                MessageVersion.None, 
                "", 
                XmlReader.Create
                (
                    File.Open
                    (
                        "ClientAcessPolicy.xml", 
                        FileMode.Open
                    )
                )
            );
    }
}                    

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WebRequest.RegisterPrefix("http://", System.Net.Browser.WebRequestCreator.ClientHttp);                    

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        private void button_Click(object sender, RoutedEventArgs e)
        {
            this._client.SendStatementCompleted += new EventHandler<AsyncCompletedEventArgs>(this._SendStatementCompleted);
            this._client.SendStatementAsync(this.textBox.Text);
        }

        private void _SendStatementCompleted(object sender, AsyncCompletedEventArgs e)
        {
            if (e.Error == null)
                MessageBox.Show("Statement send");
            else
            {
                Exception exc = e.Error;
                do
                {
                    MessageBox.Show(exc.Message);
                }
                while ((exc = exc.InnerException) != null);
            }
        }                    

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<localhost>
  <WebSites>
    <Standardwebsite>
      <MeineWebSite>
        <!--Stellt die Service Informationen bereit-->
        <Entry name="Service.svc"/>
        <Entry name="MeineWebSite.aspx"/>
        <Entry name="crossdomain.xml"/>
      </MeineWebSite>
    </Standardwebsite>
  </WebSites>
</localhost>