MarkerClusterer

Code.aspx
<cc1:GMap ID="GMap1" runat="server" />

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Code.aspx.cs
GMap1.addGMapUI(new GMapUI());
GMap1.GZoom = 2;

GMap2.addGMapUI(new GMapUI());
GMap2.GZoom = 2;

List<GMarker> markers = new List<GMarker>();

Random r = new Random();
for (int i = 0; i < 200; i++)
{
markers.Add(new GMarker(new GLatLng(r.Next(0, 60), r.Next(-30, 30))));
GListener listener = new GListener(gMarker.ID, GListener.Event.click, string.Format(@"function () {{{0}.openInfoWindowHtml('<center>{1}</center>');}}", gMarker.ID, i));
GMap1.Add(listener);
}

GMap2.markerClusterer = new MarkerClusterer(markers);


MarkerClustererStyleOptions markerClustererStyleOptions = new MarkerClustererStyleOptions();
markerClustererStyleOptions.textColor = Color.Yellow;

MarkerClustererOptions markerClustererOptions = new MarkerClustererOptions(60, 10);


MarkerClustererStyleOptions styleOptionsA = new MarkerClustererStyleOptions();
styleOptionsA.height = 36;
styleOptionsA.width = 40;
styleOptionsA.anchor_x = 6;
styleOptionsA.anchor_y = 0;
styleOptionsA.textColor = Color.Blue;
styleOptionsA.url = "http://gmaps-utility-library.googlecode.com/svn/trunk/markerclusterer/1.0/images/conv40.png";

MarkerClustererStyleOptions styleOptionsB = new MarkerClustererStyleOptions();
styleOptionsB.height = 35;
styleOptionsB.width = 35;
styleOptionsB.anchor_x = 16;
styleOptionsB.anchor_y = 0;
styleOptionsB.textColor = Color.WhiteSmoke;
styleOptionsB.url = "http://gmaps-utility-library.googlecode.com/svn/trunk/markerclusterer/1.0/images/people35.png";




markerClustererOptions.markerClustererStylesOptions.Add(styleOptionsA);
markerClustererOptions.markerClustererStylesOptions.Add(styleOptionsB);


MarkerClusterer markerClusterer = new MarkerClusterer(markers, markerClustererOptions);

GMap1.markerClusterer = markerClusterer;