How to add the starting page number from 50 in the footer of the PDF document using C# and VB.NET

using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;

Imports Syncfusion.Pdf
Imports Syncfusion.Pdf.Graphics

//Create a new PDF document
PdfDocument pdfDocument = new PdfDocument();
 
//Add a pages to the PDF document
for (int j = 0; j < 50; j++)
{
pdfDocument.Pages.Add();
}
 
//Include header
pdfDocument.Template.Top = AddHeader(pdfDocument, "Syncfusion Essential PDF", "Header and Footer Demo");
 
//Set the first page number as 50
int offset = 50;
 
//Add footer
AddFooter(pdfDocument, offset);
 
//Save and closes the document
pdfDocument.Save(@"../../Sample.pdf");
pdfDocument.Close(true);

public static PdfPageTemplateElement AddHeader(PdfDocument doc, string title, string description)
{
RectangleF rect = new RectangleF(0, 0, doc.Pages[0].GetClientSize().Width, 50);
 
//Create a page template
PdfPageTemplateElement header = new PdfPageTemplateElement(rect);
PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 24);
float doubleHeight = font.Height * 2;
Color activeColor = Color.FromArgb(44, 71, 120);
PdfSolidBrush brush = new PdfSolidBrush(activeColor);
 
PdfPen pen = new PdfPen(Color.DarkBlue, 3f);
font = new PdfStandardFont(PdfFontFamily.Helvetica, 16, PdfFontStyle.Bold);
 
//Set formattings for the text
PdfStringFormat format = new PdfStringFormat();
format.Alignment = PdfTextAlignment.Center;
format.LineAlignment = PdfVerticalAlignment.Middle;
 
//Draw title
header.Graphics.DrawString(title, font, brush, new RectangleF(0, 0, header.Width, header.Height), format);
brush = new PdfSolidBrush(Color.Gray);
font = new PdfStandardFont(PdfFontFamily.Helvetica, 6, PdfFontStyle.Bold);
 
format = new PdfStringFormat();
format.Alignment = PdfTextAlignment.Left;
format.LineAlignment = PdfVerticalAlignment.Bottom;
 
//Draw description
header.Graphics.DrawString(description, font, brush, new RectangleF(0, 0, header.Width, header.Height - 8), format);
 
//Draw some lines in the header
pen = new PdfPen(Color.DarkBlue, 0.7f);
header.Graphics.DrawLine(pen, 0, 0, header.Width, 0);
pen = new PdfPen(Color.DarkBlue, 2f);
header.Graphics.DrawLine(pen, 0, 03, header.Width + 3, 03);
pen = new PdfPen(Color.DarkBlue, 2f);
header.Graphics.DrawLine(pen, 0, header.Height - 3, header.Width, header.Height - 3);
header.Graphics.DrawLine(pen, 0, header.Height, header.Width, header.Height);
 
return header;
}

public static void AddFooter(PdfDocument doc, int offset)
{
//Set the font and brush
PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 7);
PdfBrush brush = new PdfSolidBrush(Color.Black);
 
for (int i = 0; i < doc.Pages.Count; i++)
{
    int count = i;
    string value = offset.ToString();
 
    //Create a PDF Template
    PdfTemplate template = new PdfTemplate(doc.Pages[i].GetClientSize().Width, 50);
    template.Graphics.DrawString("Page " + value, font, brush, new PointF(470, 40));
    //Draw the template on the page graphics of the document
    doc.Pages[i].Graphics.DrawPdfTemplate(template, new PointF(0, 600));
 
    //Draw string
    doc.Pages[i].Graphics.DrawString("Hello World!!!", new PdfStandardFont(PdfFontFamily.TimesRoman, 20, PdfFontStyle.Bold), brush, new PointF(0, 0));
 
    offset += 1;
}
}

'Create a new PDF document
Dim pdfDocument As PdfDocument = New PdfDocument()
'Add a pages to the PDF document
For j As Integer = 0 To 50 - 1
   pdfDocument.Pages.Add()
Next
'Include header
pdfDocument.Template.Top = AddHeader(pdfDocument, "Syncfusion Essential PDF", "Header and Footer Demo")
'Set the first page number as 50
Dim offset As Integer = 50
'Add footer
AddFooter(pdfDocument, offset)
'Save and closes the document
pdfDocument.Save("../../Sample.pdf")
pdfDocument.Close(True)

Public Function AddHeader(ByVal doc As PdfDocument, ByVal title As String, ByVal description As String) As PdfPageTemplateElement
   Dim rect As RectangleF = New RectangleF(0, 0, doc.Pages(0).GetClientSize().Width, 50)
   Dim header As PdfPageTemplateElement = New PdfPageTemplateElement(rect)
   Dim font As PdfFont = New PdfStandardFont(PdfFontFamily.Helvetica, 24)
   Dim doubleHeight As Single = font.Height * 2
   Dim activeColor As Color = Color.FromArgb(44, 71, 120)
   Dim brush As PdfSolidBrush = New PdfSolidBrush(activeColor)
   Dim pen As PdfPen = New PdfPen(Color.DarkBlue, 3.0F)
   font = New PdfStandardFont(PdfFontFamily.Helvetica, 16, PdfFontStyle.Bold)
   Dim format As PdfStringFormat = New PdfStringFormat()
   format.Alignment = PdfTextAlignment.Center
   format.LineAlignment = PdfVerticalAlignment.Middle
   header.Graphics.DrawString(title, font, brush, New RectangleF(0, 0, header.Width, header.Height), format)
   brush = New PdfSolidBrush(Color.Gray)
   font = New PdfStandardFont(PdfFontFamily.Helvetica, 6, PdfFontStyle.Bold)
   format = New PdfStringFormat()
   format.Alignment = PdfTextAlignment.Left
   format.LineAlignment = PdfVerticalAlignment.Bottom
   header.Graphics.DrawString(description, font, brush, New RectangleF(0, 0, header.Width, header.Height - 8), format)
   pen = New PdfPen(Color.DarkBlue, 0.7F)
   header.Graphics.DrawLine(pen, 0, 0, header.Width, 0)
   pen = New PdfPen(Color.DarkBlue, 2.0F)
   header.Graphics.DrawLine(pen, 0, 3, header.Width + 3, 3)
   pen = New PdfPen(Color.DarkBlue, 2.0F)
   header.Graphics.DrawLine(pen, 0, header.Height - 3, header.Width, header.Height - 3)
   header.Graphics.DrawLine(pen, 0, header.Height, header.Width, header.Height)
   Return header
End Function

Public Sub AddFooter(ByVal doc As PdfDocument, ByVal offset As Integer)
   Dim font As PdfFont = New PdfStandardFont(PdfFontFamily.Helvetica, 7)
   Dim brush As PdfBrush = New PdfSolidBrush(Color.Black)
 
   For i As Integer = 0 To doc.Pages.Count - 1
       Dim count As Integer = i
       Dim value As String = offset.ToString()
       Dim template As PdfTemplate = New PdfTemplate(doc.Pages(i).GetClientSize().Width, 50)
       template.Graphics.DrawString("Page " & value, font, brush, New PointF(470, 40))
       doc.Pages(i).Graphics.DrawPdfTemplate(template, New PointF(0, 600))
       doc.Pages(i).Graphics.DrawString("Hello World!!!", New      PdfStandardFont(PdfFontFamily.TimesRoman, 20, PdfFontStyle.Bold), brush, New PointF(0, 0))
       offset += 1
    Next
End Sub