Sharpkml saves the day when it comes to parsing KML files It's Support Point,LineString,Polygon and multigeometry objects To Convert WellKnown Text To Store in a Geo Server , PostgreSql , SQL Server db and ....
Here's how to use it:
//Load your kml just like normal
Parser parser = new Parser();
parser.ParseString(InputKml, false);
//Grab the placemark that has either a MultipleGeometry or Polygon Geomtery object
Placemark placemark = (Placemark)parser.Root;
//Extension doing what it does, giving us well known text ready for inserting into a SQL Geography column
string wkt = placemark.AsWKT();
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