google mapping, asp.net, c#

I don't believe you will find this in any web scripting code.  The lat/lon for a polygon is based on the population centroid.   You would get this from the census.  However, it looks like due to the govt shutdown, it is not available.  http://www.census.gov/tiger/tms/gazetteer/zips.txt

There are plenty of sources to purchase data from if you are interested.

hi..

If you want to use the Google Maps API have a look at their REST API, you don't need to install a Google Maps API just send a Request like

http://maps.googleapis.com/maps/api/geocode/xml?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&sensor=true_or_false

and you will get a response XML.

For more Information have a look at

https://developers.google.com/maps/documentation/geocoding/index#GeocodingRequests

*No Points*

To add to samirbhogayta's comment, it does appear that you can send simply the zip code in to Google's API as well.

e.g.

Request

http://maps.googleapis.com/maps/api/geocode/xml?address=94043&sensor=false

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Response

<GeocodeResponse>
  <status>OK</status>
  <result>
    <type>postal_code</type>
    <formatted_address>Mountain View, CA 94043, USA</formatted_address>
    <address_component>
      <long_name>94043</long_name>
      <short_name>94043</short_name>
      <type>postal_code</type>
    </address_component>
    <address_component>
      <long_name>Mountain View</long_name>
      <short_name>Mountain View</short_name>
      <type>locality</type>
      <type>political</type>
    </address_component>
    <address_component>
      <long_name>California</long_name>
      <short_name>CA</short_name>
      <type>administrative_area_level_1</type>
      <type>political</type>
    </address_component>
    <address_component>
      <long_name>United States</long_name>
      <short_name>US</short_name>
      <type>country</type>
      <type>political</type>
    </address_component>
    <geometry>
      <location>
        <lat>37.4284340</lat>
        <lng>-122.0723816</lng>
      </location>
      <location_type>APPROXIMATE</location_type>
      <viewport>
        <southwest>
          <lat>37.3857439</lat>
          <lng>-122.1084200</lng>
        </southwest>
        <northeast>
          <lat>37.4640869</lat>
          <lng>-122.0359899</lng>
        </northeast>
      </viewport>
      <bounds>
        <southwest>
          <lat>37.3857439</lat>
          <lng>-122.1084200</lng>
        </southwest>
        <northeast>
          <lat>37.4640869</lat>
          <lng>-122.0359899</lng>
        </northeast>
      </bounds>
    </geometry>
  </result>
</GeocodeResponse>

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but how to capture lat / lng from the xml is my primary question (in asp.net/c#)

Load it into an XmlDocument, and use XPath to get the values.

e.g.

using System;

namespace ConsoleApplication170
{
    class Program
    {
        static void Main(string[] args)
        {
            System.Xml.XmlDocument xdoc = new System.Xml.XmlDocument();
            string xmlResponse;
            System.Xml.XmlNode gemoetry;
            System.Xml.XmlNode location;
            System.Xml.XmlNode lat;
            System.Xml.XmlNode lng;

            using (System.Net.WebClient client = new System.Net.WebClient())
            {
                xmlResponse = client.DownloadString("http://maps.googleapis.com/maps/api/geocode/xml?address=94043&sensor=false");
            }

            xdoc.LoadXml(xmlResponse);
            gemoetry = xdoc.SelectSingleNode("/GeocodeResponse/result/geometry");
            location = gemoetry.SelectSingleNode("location");
            lat = location.SelectSingleNode("lat");
            lng = location.SelectSingleNode("lng");

            string latitude = lat.InnerText;
            string longtitude = lng.InnerText;

            Console.WriteLine("{0}, {1}", latitude, longtitude);
            Console.ReadKey();
        }
    }
}

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public string GetLocationConverter(string zip)
        {
            string url = "http://maps.google.com/maps/api/geocode/xml?address=" + zip + "&sensor=false";
            XDocument doc = XDocument.Load(url);
            string value = string.Empty;
            string lat = string.Empty;
            string lng = string.Empty;
            foreach (XElement element in doc.Element("GeocodeResponse").Elements("result").Elements("geometry").Elements("location").Descendants())
                {

                    value = element("lat");
                }
            return value;
            //throw new NotImplementedException();
        }

I have this one but just try to get "lat" and the code is not working.

Can you help?

https://www.experts-exchange.com/questions/28263886/return-value-c.html

have more questions if you have time.