<Grid x:Name="LayoutRoot">
      <ListBox x:Name="dg" Width="400" Height="200">
      </ListBox> 
          <Button x:Name="btn" Click="btn_Click" Width="100" Height="20">
      </Button>
  </Grid>

 public WS.DailyInfoSoapClient k = new DailyInfoSoapClient(); //служба

 private void btn_Click(object sender, RoutedEventArgs e)
        {
              k.GetCursOnDateCompleted+=new EventHandler<GetCursOnDateCompletedEventArgs>(k_GetCursOnDateCompleted);
            k.GetCursDynamicAsync(DateTime.Now.AddDays(-2), DateTime.Now,"EUR");
        }

void k_GetCursOnDateCompleted(object sender, GetCursOnDateCompletedEventArgs e)
        {
            dg.Items.Add(e.Result);
        }

 private void btn_Click(object sender, RoutedEventArgs e)
        {
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.XmlResolver = new XmlXapResolver();
            XmlReader reader = XmlReader.Create("http://www.cbr.ru/scripts/XML_daily.asp");
            reader.MoveToContent();
            while (reader.Read())
           {
               if (reader.NodeType == XmlNodeType.Element && reader.Name == "ValCurs")
                {
                  dg.Items.Add(new ListBoxItem()
                  {
                      Content = reader.GetAttribute("Name") +
                            ", " + reader.GetAttribute("Value")
                  });
                }

               if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "ValCurs")
                {
                    MessageBox.Show("Error read!");
                }

            }
            reader.Close();
        }

[Async_ExceptionOccurred]
Аргументы: 
Недоступны строки отлаживаемых ресурсов. Ключ и аргументы часто предоставляют достаточно информации для диагностики проблемы. См. http://go.microsoft.com/fwlink/?linkid=106663&Version=4.0.50524.0&File=System.dll&Key=Async_ExceptionOccurred

   в System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
   в SilverlightApplication6.WS.GetCursOnDateCompletedEventArgs.get_Result()
   в SilverlightApplication6.Home.k_GetCursOnDateCompleted(Object sender, GetCursOnDateCompletedEventArgs e)
   в SilverlightApplication6.WS.DailyInfoSoapClient.OnGetCursOnDateCompleted(Object state)

private void btn_Click(object sender, RoutedEventArgs e)
        {
            k.GetCursOnDateCompleted += new EventHandler<GetCursOnDateCompletedEventArgs>(k_GetCursOnDateCompleted);
            k.GetCursOnDateAsync(DateTime.Now);
        }

        void k_GetCursOnDateCompleted(object sender, GetCursOnDateCompletedEventArgs e)
        {
            dg.Items.Add(e.Result);
        }

<configuration>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="DailyInfoSoap" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
                    <security mode="None" />
                </binding>
            </basicHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://www.cbr.ru/DailyInfoWebServ/DailyInfo.asmx"
                binding="basicHttpBinding" bindingConfiguration="DailyInfoSoap"
                contract="WS.DailyInfoSoap" name="DailyInfoSoap" />
        </client>
    </system.serviceModel>
</configuration>

 dg.ItemsSource = e.Result.Select<System.Collections.ObjectModel.ObservableCollection<object>,
                Tuple<string, string, string, string, string>>(
                i => Tuple.Create<string, string, string, string, string>(
                    i[0].ToString(), i[1].ToString(), i[2].ToString(), i[3].ToString(), i[4].ToString()
                    ));

[DataContract]
        class CursOnDate 
        {
            [DataMember]
                    public string Vname
                    {
                        get
                        {
                            return Vname;
                        }
                        set
                        {
                            Vname = value;
                        }
                    }

            public string Vnom
            {
                get
                {
                    return Vnom;
                }
                set
                {
                    Vnom = value;
                }
            }
            public string Vcurs
            {
                get
                {
                    return Vcurs;
                }
                set
                {
                    Vcurs = value;
                }
            }
            public string Vcode
            {
                get
                {
                    return Vcode;
                }
                set
                {
                    Vcode = value;
                }
            }
            public string VchCode
            {
                get
                {
                    return VchCode;
                }
                set
                {
                    VchCode = value;
                }
            }
        
     }

 XmlDocument CourseCBR = new XmlDocument();
            CourseCBR.Load("http://www.cbr.ru/scripts/XML_daily.asp");
            XmlNode oNode = CourseCBR.DocumentElement;
            XmlNodeList oNodeList_Value = oNode.SelectNodes("/ValCurs/Valute/Name");
            XmlNodeList oNode_Value = oNode.SelectNodes("/ValCurs/Valute/Value");
        Response.Write(oNodeList_Value.Item(1).OuterXml.ToString() + " : " + oNode_Value.Item(1).OuterXml.ToString());
            

[DataContract]
      public  class CursOnDate 
        {
        public string  _Vname;
[DataMember]
           public string Vname
           {
             get
                 {
                  return _Vname;
                 }
             set
                 {
                  _Vname = value;
                 }
           }
        }

for(int i=0; i<15;i++)
   {
     Response.Write(oNodeList_Value.Item(i).OuterXml.ToString() + " : " + oNode_Value.Item(i).OuterXml.ToString());
 // типа EUR : 39.3456 USD : 30.5534 и.т.д
   }