Asynchronously load an XML file

I use this function to reverse geocoding using Google Maps and load an XML with the results:

Private Function ReverseGeocode(ByVal Latitud As Double, ByVal Longitud As Double) As String

    Dim webClient As New System.Net.WebClient
    Dim sURL As String = "http://ift.tt/1vcPO4Q"
    sURL = sURL.Replace("@lat", Latitud)
    sURL = sURL.Replace("@long", Longitud)

    Dim result As String = webClient.DownloadString(sURL)
    Dim xmlDoc As New XmlDocument()
    xmlDoc.LoadXml(result)

    Dim m_nodelist As XmlNodeList
    m_nodelist = xmlDoc.SelectNodes("/GeocodeResponse/result/formatted_address")
    ReverseGeocode = m_nodelist(0).InnerText
End Function

My question: can this be done using an asynchronous method?