How to get the height of a PdfGrid?

//Create a new document.
PdfDocument doc = new PdfDocument();
//Add a page
PdfPage page = doc.Pages.Add();
//Create Pdf graphics for the page
PdfGraphics graphics = page.Graphics;
PdfGrid pdfGrid = new PdfGrid();
DataTable table = CreateDataTable();
//Assigns data source.
pdfGrid.DataSource = table;
//Calculate the PdfGridTable height 
float gridHeight = 0.0f;
gridHeight = CalculateGridHeight(pdfGrid);       
//Draws grid to the page of PDF document.
pdfGrid.Draw(page, new PointF(10, 10));
//Saves the document.
doc.Save("Output.pdf");
doc.Close(true);
//Method used for calculating Pdf Grid height
public float CalculateGridHeight(PdfGrid pdfGrid)
{
//Create a new document.
PdfDocument doc = new PdfDocument();
//Add a page
PdfPage page = doc.Pages.Add();
//Create Pdf graphics for the page
PdfGraphics graphics = page.Graphics;
//Draw the table
PdfLayoutResult result = pdfGrid.Draw(page, new PointF(0, 0));
float height = result.Bounds.Height;
//Close the document
doc.Close();    
return height;            
}