Need help with loop to create dynamic markers on a map.

Posted on 2008-10-15
Last Modified: 2013-12-17
How would i get this code to create markers on my map? Below is the code I want to loop through to create the marker, and the code have that connects to the db that has the map coordinance.

below is the code to add a markers,  i just need to know how i would loop this to make it happen

The variables past in from my db are "pxq" and "pyq"

Thanks for any help.

=====   Code i want to loop through and create markers : ========

// pxq & pyq are variable that feed coordinance into the map marker code

        GLatLng latlon = new GLatLng(pxq, pyq);

        GMarker icono = new GMarker(latlon);

        GInfoWindow window = new GInfoWindow(icono, x,false,



======  This is the code i have:  ===============

SqlConnection sqlConnection2 = new SqlConnection("Data Source=.\\SQLEXPRESS  works ....");

    //  SqlCommand cmd = new SqlCommand();

        SqlCommand cmd = new SqlCommand();


	string qustring = "SELECT * FROM xyq ";

cmd.CommandText = qustring;

cmd.CommandType = CommandType.Text;

        cmd.Connection = sqlConnection2;

        //OpenFile connection



        SqlDataReader reader = cmd.ExecuteReader();

           while (reader.Read())


                object zoq = reader[0].ToString();

                object xqt = reader[1].ToString();

                object yqt = reader[2].ToString();

             // converting object to double

                double pxq = double.Parse(xqt.ToString());

                double pyq = double.Parse(yqt.ToString());

	     // pxq and pyq are public vars



        //close connection


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Question by:bmanmike39
  • 2

Accepted Solution

web4net earned 500 total points
ID: 22726944
Why reinvent the wheel ... please let me know if the following solution works for you (if not, I have other solutions):  

Expert Comment

ID: 22822882
Any updates?

Here is my sample code.
using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.SqlClient;

using GoogleGeocoder;

using System.Text; 

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


    protected void Page_Load(object sender, EventArgs e)



        totalMatchingTitle.Visible = IsPostBack;

        clickInstructions.Visible = IsPostBack; 



    protected void startSearchButton_Click(object sender, EventArgs e)


        clickInstructions.Visible = true; 


        Coordinate coordinate = Geocode.GetCoordinates(addressTextBox.Text);

        LocationsData data = GetLocationData(coordinate);

        // Set up the locations 

        searchResults.DataSource = data.Location;


        // Set result count

        totalResultCount.Text = data.Location.Rows.Count > 0 ? data.Location.Rows.Count.ToString() : "No Results Found.";  


        // Get the locations, in JSON format. 

        string jsonScript = GetJSONLocations(data);

        // Get the home location (where the user entered their address) in JSON format. 

        string homeSpatialInfo = GetJsonHomeSpatialInfo(coordinate, addressTextBox.Text);

        // Write the JSON objects to the client. 

        ClientScript.RegisterClientScriptBlock(GetType(), "homeSpatialInfo", homeSpatialInfo, true); 

        ClientScript.RegisterClientScriptBlock(GetType(), "jsonMapObjects", jsonScript, true);


    /// <summary>

    /// Gets the store locations and the coordinate for the "from" area (the address the user entered). 

    /// </summary>

    /// <param name="coordinate">A coordinate.</param>

    /// <param name="data">A LocationsData dataset.</param>

    private LocationsData GetLocationData(Coordinate coordinate)


        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["StoresDb"].ConnectionString);



        string SQL = "GetNearbyLocations";

        SqlCommand command = new SqlCommand(SQL, connection);

        command.Parameters.Add(new SqlParameter("@CenterLatitude", coordinate.Latitude));

        command.Parameters.Add(new SqlParameter("@CenterLongitude", coordinate.Longitude));

        command.Parameters.Add(new SqlParameter("@SearchDistance", distanceDropDown.SelectedValue));

        command.Parameters.Add(new SqlParameter("@EarthRadius", 3961));  // In Miles

        command.CommandType = CommandType.StoredProcedure;

        SqlDataAdapter da = new SqlDataAdapter(command);

        LocationsData data = new LocationsData(); 


        return data; 


    /// <summary>

    /// Gets a json variable for the home address and latitude/longitude coordinates.

    /// </summary>

    /// <param name="coordinate">The coordinate.</param>

    /// <param name="fromAddress">The address that of where the map is going to be locaed "from".</param>

    /// <returns>A string representation of a JSON variable.</returns>

    protected string GetJsonHomeSpatialInfo(Coordinate coordinate, string fromAddress)


        string top = "var homeSpatialInfo = {"; 

        string bottom = "};";

        string jsonVariable = String.Format("\"latitude\" : \"{0}\", \"longitude\" : \"{1}\", \"fromAddress\" : \"{2}\"", coordinate.Latitude, coordinate.Longitude, HttpUtility.UrlEncode(fromAddress));

        return String.Concat(top, jsonVariable, bottom, Environment.NewLine); 


    /// <summary>

    /// Retursn a JSON object in the format of a string. 

    /// <remarks>

    /// It should return a string that resembles a JSON object array in this format: 

    /// <example>

    /// var ProximityLocations = {"locations": [

    ///            {"name": "testName", "address": "123 test addre", "urladdress": "123+test+addre", "longitude": "192.009", "latitude" : "65.235"},

    ///            {"name": "tesdsfsdftName", "address": "65 test addre", "urladdress": "123+test+addre", "longitude": "3342.009", "latitude" : "633.235"},

    ///            {"name": "te33333333", "address": "123 test addre", "urladdress": "123+test+addre", "longitude": "123492.009", "latitude" : "15.235"}

    ///           ]};

    /// </example>


    /// If there are no locations, the JSON object will be empty. 

    /// </remarks>

    /// </summary>

    /// <param name="data">The LocationData dataset that has the locations in it.</param>

    /// <returns>A string representation of a JSON object.</returns>

    protected string GetJSONLocations(LocationsData data)


        string firstLine = "var ProximityLocations = {\"locations\": ["; 

        string lastLine = "]};";

        string JSONObjectFormat = "\"name\": \"{0}\", \"address\": \"{1}\", \"urladdress\": \"{2}\", \"longitude\": \"{3}\", \"latitude\" : \"{4}\"";

        StringBuilder builder = new StringBuilder();


        string jsonLocation; 

        string locationAddress; 

        foreach (LocationsData.LocationRow row in data.Location)


            locationAddress = String.Format("{0}, {1}, {2}, {3}", row.Address, row.City, row.State, row.Zip);

            jsonLocation = String.Concat("{", String.Format(JSONObjectFormat,






                "}", Environment.NewLine);


            // Only add comma if it is not the last row. The last row does not have a comma. See example in method comments.

            if (data.Location.Rows.IndexOf(row) != data.Location.Rows.Count-1)






        return builder.ToString(); 


    /// <summary>

    /// A variable to count the number of iterations in the repeater. Used for displaying organized data.

    /// </summary>

    protected int _itemCount = 0; 

    protected void searchResults_ItemDataBound(object sender, RepeaterItemEventArgs e)


        // Add the number to the screen for organization.

        if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)



            Literal locationNumber =(Literal) e.Item.FindControl("locationNumber");

            locationNumber.Text = _itemCount.ToString(); 




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