How to set the page margin in a PDF using C# and VB.NET

using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using System.Drawing;

Imports Syncfusion.Pdf
Imports Syncfusion.Pdf.Graphics
Imports System.Drawing

//Create a PDF document
PdfDocument document = new PdfDocument();
//Set margin to all the pages
document.PageSettings.Margins.All = 50;
//Add a page
PdfPage page = document.Pages.Add();
//Create PDF graphics for the page
PdfGraphics graphics = page.Graphics;
//Creates a solid brush
PdfBrush brush = new PdfSolidBrush(Color.Black);
//Set the font
PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 14);
//Draw the text
graphics.DrawString("Hello world!", font, brush, new PointF(20, 20));
//Draw Rectangle
graphics.DrawRectangle(PdfPens.Red, new RectangleF(0, 0, page.GetClientSize().Width, page.GetClientSize().Height));
//Save the document
document.Save("Margin.pdf");
//Close the docuemnt
document.Close(true);
//This will open the PDF file so, the result will be seen in default PDF viewer 
Process.Start("Margin.pdf");

'Create a PDF document
Dim document As PdfDocument = New PdfDocument()
'Set margin to all the pages
document.PageSettings.Margins.All = 50
'Add a page
Dim page As PdfPage = document.Pages.Add()
'Create PDF graphics for the page
Dim graphics As PdfGraphics = page.Graphics
'Creates a solid brush
Dim brush As PdfBrush = New PdfSolidBrush(Color.Black)
'Set the font
Dim font As PdfFont = New PdfStandardFont(PdfFontFamily.Helvetica, 14)
'Draw the text
graphics.DrawString("Hello world!", font, brush, New PointF(20, 20))
'Draw Rectangle
graphics.DrawRectangle(PdfPens.Red, New RectangleF(0, 0, page.GetClientSize().Width, page.GetClientSize().Height))
'Save the document
document.Save("Margin.pdf")
'Close the document
document.Close(True)
'This will open the PDF file so, the result will be seen in default PDF viewer 
Process.Start("Margin.pdf")