How to get PDF page dimensions

How to get PDF page dimensions

I have an existing pdf and extracting text from the pdf. Here is the code
I have already
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
using System.IO;
public string ReadPdfFile(string fileName)
{
StringBuilder text = new StringBuilder();
if (File.Exists(fileName))
{
PdfReader pdfReader = new PdfReader(fileName);
for (int page = 1; page <= pdfReader.NumberOfPages; page++)
{
ITextExtractionStrategy strategy = new
SimpleTextExtractionStrategy();
string currentText =
PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
currentText =
Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default,
Encoding.UTF8, Encoding.Default.GetBytes(currentText)));
text.Append(currentText);
}
pdfReader.Close();
}
return text.ToString();
}
I would like to get the dimensions of the pdf page. I need the dimensions
so I can create a wrapper class that contains this information. Then the
class can determine if rectangles are out of bounds.