HowTo : How can I calculate the Area and the Length of a vdPolyHatch object

private void button1_Click(object sender, EventArgs e)
{
   vdFramedControl1.BaseControl.ActiveDocument.Open(@"c:\321\Hatch\test.vdml"); // I have used a test drawing that containd a hatch
   VectorDraw.Professional.vdFigures.vdPolyhatch pHatch = vdFramedControl1.BaseControl.ActiveDocument.ActiveLayOut.Entities[4] as VectorDraw.Professional.vdFigures.vdPolyhatch;// this is the vdPolyHatch object that I need to calculate the length and area
   if (pHatch == null) return;
   double area = pHatch.ToMesh(0).Area();
   double length1 =0.0d;

   foreach (VectorDraw.Professional.vdCollections.vdCurves curves in pHatch.PolyCurves)
   {
      foreach (VectorDraw.Professional.vdFigures.vdCurve curve in curves)
      {
         length1 += curve.Length();
      }
   }
   this.Text = "Area: " + area.ToString(); +" Length: " + length1.ToString();
}