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Here are two rectangles drawn on top of the map of the States. This is WFS 1.0.0 filter with two Intersects combined with OR <ogc:Filter> <ogc:Or> <ogc:Intersects> <ogc:PropertyName>topp:the_geom</ogc:PropertyName> <gml:Polygon> <gml:outerBoundaryIs> <gml:LinearRing> <gml:coordinates decimal="." cs="," ...
What you want is SharpMap. It's a GPL spatial library for .NET C#.
Have you tried using Intersects or Overlaps? Here are examples: http://mapserver.org/ogc/filter_encoding.html#currently-supported-features https://wiki.state.ma.us/confluence/display/massgis/GeoServer+-+WFS+-+Filter+-+Overlaps
This works: http://mymapservice.com/?request=GetFeature&service=WFS&typename=county_roads_wms_only:Roads&filter=<ogc:Filter><ogc:Or><ogc:PropertyIsLike escape="\" singleChar="_" ...
3D City DB may be an option for you. It is "open source and released under the terms of LGPL" and supports CityGML, Oracle and PostGIS.
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