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convert-kml-to-gpx.cs

string sourceFile = "destination.kml";
string outputFile = "output.gpx";

// Specify conversion settings if necessary. It is optional.
ConversionOptions options = null;

// This options assigns Wgs84 to the destination layer.
// Conversion may throw error If destination layer does not support the Wgs84 spatial reference. So need to check.
if (Drivers.Shapefile.SupportsSpatialReferenceSystem(SpatialReferenceSystem.Wgs84))
{
    options = new ConversionOptions()
    {
        DestinationSpatialReferenceSystem = SpatialReferenceSystem.Wgs84,
    };
}

// Convert KML to GPX
VectorLayer.Convert(sourceFile, Drivers.Kml, outputFile, Drivers.Gpx, options);