Find Co-ordinates (Latitude and Longitude) of an Address Location using Google Geocoding API in ASP.Net using C#

The Google Geocoding API accepts address as parameter and returns the Geographical Co-ordinates and other information in XML or JSON format.

Namespaces

You will need to import the following namespaces.

using System.IO;

using System.Net;

using System.Text;

using System.Data;

<form id="form1" runat="server">

    <div>

    <asp:TextBox ID="txt_Location" runat="server" Text=""></asp:TextBox>

<asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="FindCoordinates" />

<br />

<br />

<asp:GridView ID="GrdViewLocation" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"

    runat="server" AutoGenerateColumns="false">

    <Columns>

        <asp:BoundField DataField="Id" HeaderText="Id" />

        <asp:BoundField DataField="Address" HeaderText="Address" />

        <asp:BoundField DataField="Latitude" HeaderText="Latitude" />

        <asp:BoundField DataField="Longitude" HeaderText="Longitude" />

    </Columns>

</asp:GridView>

    </div>

    </form>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.IO;

using System.Net;

using System.Text;

using System.Data;

public partial class Default3 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void FindCoordinates(object sender, EventArgs e)

    {

        string url = "http://maps.google.com/maps/api/geocode/xml?address=" + txt_Location.Text + "&sensor=false";

        WebRequest request = WebRequest.Create(url);

        using (WebResponse response = (HttpWebResponse)request.GetResponse())

        {

            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))

            {

                DataSet dsResult = new DataSet();

                dsResult.ReadXml(reader);

                DataTable dtCoordinates = new DataTable();

                dtCoordinates.Columns.AddRange(new DataColumn[4] { new DataColumn("Id", typeof(int)),

                        new DataColumn("Address", typeof(string)),

                        new DataColumn("Latitude",typeof(string)),

                        new DataColumn("Longitude",typeof(string)) });

                foreach (DataRow row in dsResult.Tables["result"].Rows)

                {

                    string geometry_id = dsResult.Tables["geometry"].Select("result_id = " + row["result_id"].ToString())[0]["geometry_id"].ToString();

                    DataRow location = dsResult.Tables["location"].Select("geometry_id = " + geometry_id)[0];

                    dtCoordinates.Rows.Add(row["result_id"], row["formatted_address"], location["lat"], location["lng"]);

                }

                GrdViewLocation.DataSource = dtCoordinates;

                GrdViewLocation.DataBind();

            }

        }

    }

}