Latitude and Longitude Lookup with jQuery, C#, ASP.NET MVC

This asp.net mvc controller action returns a place latitude and longitude based on zipcode and country name,

public ActionResult LookupCoordinates(string Zip, string Country)
{
    string Lat = "";
    string Lon = "";
    string PostUrl = "http://ws.geonames.org/postalCodeSearch?postalcode=" + Zip + "&maxRows=10&country=" + Country;
    WebResponse webResponse = webRequest.GetResponse();
    if (webResponse == null)
    { }
    else
    {
        StreamReader sr = new StreamReader(webResponse.GetResponseStream());
        string Result = sr.ReadToEnd().Trim();
        if (Result != "")
        {
            // Load the response into an XML doc
            XmlDocument xdoc = new XmlDocument();
            xdoc.LoadXml(Result);
            //  Navigate to latitude node
            XmlNodeList name = xdoc.GetElementsByTagName("lat");
            if (name.Count > 0)
            {
                Lat = name[0].InnerText;
            }
            //  Navigate to longitude node
            name = xdoc.GetElementsByTagName("lng");
            if (name.Count > 0)
            {
                 Lon = name[0].InnerText;
            }
        }
    }
    return Json(Lat + "," + Lon);
}

and the jquery function for implementing this would be,

function LookupCoordinates(zip) {
        $.post("/Home/LookupCoordinates",
        { Zip: zip, Country: "US" },
        function(data) {
            var result = eval('(' + data + ')');
            var coordinates = result.split(",");
            $("#Lat").val(coordinates[0]);
            $("#Lon").val(coordinates[1]);
        });
    }

Change contry to IN for india...