Update README.md

premium-samples/admin-regions/README.md

@@ -10,6 +10,11 @@ Administrative regions are polygons defined by the borders of administrative uni
 
 Our partner [digital data services gmbh](http://www.ddsgeo.de/) provides both geography and the corresponding socio-economic data in various formats. The most popular format is [GeoJSON](http://geojson.org/). GeoJSON can be processed directly in JavaScript and Leaflet, and also [directly displayed on GitHub](https://github.com/ptv-logistics/xserverjs/blob/master/premium-samples/admin-regions/data/municipalities.json),
 
+While the samples included here can be implemented only with pure JavaScript, there are scenarios which require more complex data. This data usually cannot be handled by the browser directly and has to be "pre rendered" by a middle-ware. There are many samples in the web for this practice and we provide some tutorials for C# on GitHub:
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+https://github.com/ptv-logistics/SpatialTutorial/wiki
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+https://github.com/ptv-logistics/SharpMap.Widgets
 
 ### Add admininstrative regions as GeoJSON to the map