using ProjNet.CoordinateSystems;  

using ProjNet.CoordinateSystems.Transformations;  

using ProjNet.Converters.WellKnownText;  

using System.Text; // Required for Encoding  

using System;

​

public class Program

{

    public static void Main()

    {

        var wgs84 = GeographicCoordinateSystem.WGS84;  

​

        string nztm2000Wkt = @"  

        PROJCS[""NZGD2000 / New Zealand Transverse Mercator 2000"",  

            GEOGCS[""NZGD2000"",  

                DATUM[""New_Zealand_Geodetic_Datum_2000"",  

                    SPHEROID[""GRS 1980"",6378137,298.257222101]],  

                PRIMEM[""Greenwich"",0],  

                UNIT[""degree"",0.0174532925199433]],  

            PROJECTION[""Transverse_Mercator""],  

            PARAMETER[""latitude_of_origin"",0],  

            PARAMETER[""central_meridian"",173],  

            PARAMETER[""scale_factor"",0.9996],  

            PARAMETER[""false_easting"",1600000],  

            PARAMETER[""false_northing"",10000000],  

            UNIT[""metre"",1],  

            AXIS[""Easting"",EAST],

            AXIS[""Northing"",NORTH]]";  

​

        var nztm2000 = (ProjectedCoordinateSystem)CoordinateSystemWktReader.Parse(nztm2000Wkt, Encoding.UTF8);  

​

        var ctFactory = new CoordinateTransformationFactory();  

​

        var wgs84ToNztm2000 = ctFactory.CreateFromCoordinateSystems(wgs84, nztm2000);  

​

        var transformedCoord = wgs84ToNztm2000.MathTransform.Transform(new double[] { 171.893029, -42.098068 });  

​

        Console.WriteLine($"NZTM2000 Easting: {transformedCoord[0]}, Northing: {transformedCoord[1]}");  

​

​

​

​

    }

}