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Posted 18 Jan 2009
Licenced MIT

GMap.NET - Great Maps for Windows Forms and Presentation

, 16 Apr 2013
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GMap.NET is a powerful, free, cross platform, Open Source .NET control. It enables the use of routing, geocoding, and maps from Google, Yahoo!, OpenStreet in Windows Forms and Presentation, and supports caching!



Google Maps are cool, yeah? But it's useful only in the browser, and is insufficient for real time tracking. It also does not have cache so Google servers are overloaded. This control removes all these deficiencies! It also gives the .NET developer unlimited ability to extend it!

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding, directions and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex,,,, NearMap, OviMap, CloudMade, WikiMapia, MapQuest in Windows Forms & Presentation, supports caching and runs on windows mobile! 


The basic idea is simple: get the required data from Google/etc., cache it, and use it. Fast, simple, and practical.

Using the Code

It's more than easy. GMap.NET.dll and GMap.NET.WindowsForms.dll contain the user control. Add it to your project and simply use it.

Here are the basic control initial options: 

public MainForm()


   System.Net.IPHostEntry e =
   MainMap.Manager.Mode = AccessMode.CacheOnly;
   MessageBox.Show("No internet connection avaible, going to CacheOnly mode.", 
         "GMap.NET - Demo.WindowsForms", MessageBoxButtons.OK,

// config map
MainMap.MapProvider = GMapProviders.OpenStreetMap;
MainMap.Position = new PointLatLng(54.6961334816182, 25.2985095977783);
MainMap.MinZoom = 0;
MainMap.MaxZoom = 24;
MainMap.Zoom = 9;

// add your custom map db provider
//GMap.NET.CacheProviders.MySQLPureImageCache ch = new GMap.NET.CacheProviders.MySQLPureImageCache();
//ch.ConnectionString = @"server=sql2008;User Id=trolis;Persist Security Info=True;database=gmapnetcache;password=trolis;";
//MainMap.Manager.SecondaryCache = ch;

// set your proxy here if need
//GMapProvider.WebProxy = new WebProxy("", 8080);
//GMapProvider.WebProxy.Credentials = new NetworkCredential("", "bilgeada");

// map events
   MainMap.OnPositionChanged += new PositionChanged(MainMap_OnPositionChanged);

   MainMap.OnTileLoadStart += new TileLoadStart(MainMap_OnTileLoadStart);
   MainMap.OnTileLoadComplete += new TileLoadComplete(MainMap_OnTileLoadComplete);

   MainMap.OnMapZoomChanged += new MapZoomChanged(MainMap_OnMapZoomChanged);
   MainMap.OnMapTypeChanged += new MapTypeChanged(MainMap_OnMapTypeChanged);

   MainMap.OnMarkerClick += new MarkerClick(MainMap_OnMarkerClick);
   MainMap.OnMarkerEnter += new MarkerEnter(MainMap_OnMarkerEnter);
   MainMap.OnMarkerLeave += new MarkerLeave(MainMap_OnMarkerLeave);

   MainMap.OnPolygonEnter += new PolygonEnter(MainMap_OnPolygonEnter);
   MainMap.OnPolygonLeave += new PolygonLeave(MainMap_OnPolygonLeave);

   MainMap.OnRouteEnter += new RouteEnter(MainMap_OnRouteEnter);
   MainMap.OnRouteLeave += new RouteLeave(MainMap_OnRouteLeave);

   MainMap.Manager.OnTileCacheComplete += new TileCacheComplete(OnTileCacheComplete);
   MainMap.Manager.OnTileCacheStart += new TileCacheStart(OnTileCacheStart);
   MainMap.Manager.OnTileCacheProgress += new TileCacheProgress(OnTileCacheProgress);

As you can see, the control options are quite simple. And there is nothing more to add.

Points of Interest

Well, it was quite cryptic to figure out how Google manages tiles, what coordinate system it uses, the JSON decryption, etc.


Go to the project's CodePlex site to get a running update of any changes or improvements I've made.  


This article, along with any associated source code and files, is licensed under The MIT License


About the Author
Software Developer
Lithuania Lithuania
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QuestionHow to address individual marker? Pin
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QuestionAnyone done anything with Marker clustering? Pin
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SuggestionCould you provide links for examples of drawing a vector layer on top map source? Pin
Dan Randolph27-Apr-17 10:23
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AnswerRe: Could you provide links for examples of drawing a vector layer on top map source? Pin
Dan Randolph27-Apr-17 12:12
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QuestionUsing Satellite map other than Bing Pin
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QuestionGmap Control shows no more the "standard" openstreetmap Pin
Member 1271736112-Mar-17 4:10
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AnswerRe: Gmap Control shows no more the "standard" openstreetmap Pin
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GeneralRe: Gmap Control shows no more the "standard" openstreetmap Pin
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QuestionTilt Map Pin
Member 42973466-Aug-14 17:27
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QuestionReally wished this worked. Pin
microvb27-Jul-14 8:22
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AnswerRe: Really wished this worked. Pin
radioman.lt29-Jul-14 2:31
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Questionmultiple Marker Cursor freeze to "Hand" Pin
willi-5822-Feb-14 4:19
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AnswerRe: multiple Marker Cursor freeze to "Hand" Pin
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GeneralRe: multiple Marker Cursor freeze to "Hand" Pin
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QuestionGood job! Pin
g0d20127-Jan-14 20:06
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GeneralMy vote of 5 Pin
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GeneralRe: My vote of 1 Pin
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