Urgent :current page number of pdf file displayed inside a webpage

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C#

ASP.NET

I'm using asp.net ,C# to display a pdf file in a page.
see code below
in aspx file

<object data="<%=pdfPath%>" type="application/pdf"    
                    style="height:812px; width: 603px"500px" align="top" >
                </object>

in aspx.cs file (src is the file upload control to select pdf file

protected void ShowPdf()
     {
       
     
        if (src.FileName != "")
        {
            lblFile.Text = Server.MapPath(src.FileName)
            src.SaveAs(Server.MapPath(src.FileName));
            pdfPath = src.FileName;
          
            divPDF.Visible = true;
        } 
    }

this is working fyn..

now what i need is to extract the page where cursor is focusing to another folder.
i tried the below code

PdfExtractorUtility Epdf = new PdfExtractorUtility();
protected void cmdExtract_Click(object sender, EventArgs e)
      {
                    
          PdfReader r = new PdfReader(lblFile.Text);
         
          int n = r.NumberOfPages;
          String[] labelstrings = new String[n];
          labelstrings = PdfPageLabels.GetPageLabels(r);
          Response.Write(labelstrings);
          Epdf.ExtractPage(lblFile.Text, Server.MapPath(dest.FileName),labelstrings[0]);
}

where extract page is the function i got from itextsharp
see
http://www.codeproject.com/Articles/559380/SplittingplusandplusMergingplusPdfplusFilesplusinp#iTextExampleCodeExtractSinglePage

but the pagenumber is not coming into the labelstring variable.
Please advice how to get the current page number of pdf