将纬度和经度转换为43区域中的utm点

Question

我有纬度和经度点（23.7019973789308,72.5465551902882） 像这样，我有很多观点，用户在我的应用程序中输入， 我只想在C＃的43区用米转换它们。 我没有得到任何合适的代码，谁可以转换这些点。 我也通过这个链接，但没有得到解决方案。 http://www.igorexchange.com/node/927

我也试过这个代码......

  static public IPoint FromLatLonToUTM(double lon, double lat, out double UTM_x, out double UTM_y)
  {
  ISpatialReferenceFactory2 pSpatRefFact;
  IProjectedCoordinateSystem pToPCS; 
  IGeographicCoordinateSystem pFromGCS; 
  IGeometry pGeo ; 
  IPoint pPoint;

  UTM_x = 0;
  UTM_y = 0;

  pPoint = new PointClass();
  pPoint.PutCoords(lon, lat);

  pSpatRefFact = new SpatialReferenceEnvironmentClass();

  pFromGCS = pSpatRefFact.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_NAD1983);
  pToPCS = pSpatRefFact.CreateProjectedCoordinateSystem((int)esriSRProjCSType.esriSRProjCS_NAD1983UTM_17N);

  pGeo = pPoint;
  pGeo.SpatialReference = pFromGCS;

  pGeo.Project (pToPCS);

  pPoint = (IPoint) pGeo;
  UTM_x =  pPoint.X;
  UTM_y = pPoint.Y;
          Debug.Write(UTM_x);
          Debug.WriteLine("");
          Debug.Write(UTM_y);
          Debug.WriteLine("");
  return  pPoint;
}

帮助我.............