How to get page number from signature field in a PDF document using C# and VB.NET

using Syncfusion.Pdf;
using Syncfusion.Pdf.Parsing;

Imports Syncfusion.Pdf
Imports Syncfusion.Pdf.Parsing

PdfLoadedDocument document = new PdfLoadedDocument(@"../../Data/Input.pdf");
 
//Load the page collections.
PdfLoadedPageCollection loadedPages = document.Pages;
int pageIndex = -1;
 
var pdfForm = document.Form;
 
//Existing PDF document pages.
for (int i = 0; i < loadedPages.Count; i++)
{
    PdfLoadedPage loadedPage = loadedPages[i] as PdfLoadedPage;
    if (pdfForm != null)
    {
       foreach (PdfLoadedField field in pdfForm.Fields)
          {
              if (field is PdfLoadedSignatureField)
                 {
                    // Get the page number of the `signatureField`?
                    if (loadedPage == field.Page)
                       {
                          pageIndex = i + 1;
                          Console.WriteLine(field.Name + " is in the page of " + pageIndex);
                       }
                 }
          }
 
    }
}
Console.ReadKey();
 

        Dim document As PdfLoadedDocument = New PdfLoadedDocument("../../Data/Input.pdf")
        Dim loadedPages As PdfLoadedPageCollection = document.Pages
        Dim pageIndex As Integer = -1
        Dim pdfForm = document.Form
        Dim signatureField As PdfLoadedSignatureField = Nothing
 
        For i As Integer = 0 To loadedPages.Count - 1
            Dim loadedPage As PdfLoadedPage = TryCast(loadedPages(i), PdfLoadedPage)
 
            If pdfForm IsNot Nothing Then
 
                For Each field As PdfLoadedField In pdfForm.Fields
 
                    If TypeOf field Is PdfLoadedSignatureField Then
 
                        If loadedPage Is field.Page Then
                            pageIndex = i + 1
                            Console.WriteLine(field.Name & " is in the page of " & pageIndex)
                        End If
                    End If
                Next
            End If
        Next
 
        Console.ReadKey()