A .Net port of osmtogeojson (https://github.com/tyrasd/osmtogeojson)
Install Nuget Package: OsmToGeoJSON
OsmToGeoJSON.Net was designed to convert the Json output from http://overpass-turbo.eu/
var converter = new Converter(); var geojson = converter.OsmToGeoJSON(osmJson);
or
var featureCollection = converter.OsmToFeatureCollection(osmJson);