public class CoordinateConverterUtilities
{
#if WIN64
    private const string DllImport = @"Plugins/ETRS89_LAMBERT_UTM_64bits.dll";
#else
    private const string DllImport = @"Plugins/ETRS89_LAMBERT_UTM_32bits.dll";
#endif

    #region Coordinate conversion functions using NGI DLL

    //Import the dll with the functions to calculate lambert coordinates
    [DllImport(DllImport, SetLastError = true, CharSet = CharSet.Auto)]
    public static extern int GeoETRS89ToLambert72(double Xi, double Yi, double Zi, ref double xo, ref double yo, ref double Ho);

    [DllImport(DllImport, SetLastError = true, CharSet = CharSet.Auto)]
    public static extern int Lambert72ToLambert08(double Xi, double Yi, double Zi, ref double xo, ref double yo, ref double Ho);

    [DllImport(DllImport, SetLastError = true, CharSet = CharSet.Auto)]
    public static extern int Lambert72ToGeoETRS89(double Xi, double Yi, double Zi, ref double xo, ref double yo, ref double Ho);

    #endregion
}