How to replace fonts in a PDF using C# and VB.NET

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

Imports Syncfusion.Pdf.Graphics
Imports Syncfusion.Pdf.Parsing

//Load an existing PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf");
 
//Replace font 
loadedDocument.UsedFonts[0].Replace(new PdfStandardFont(PdfFontFamily.Courier, 12));
 
//Save the document
loadedDocument.Save("ReplacedFontPDF.pdf");
 
//Close the document
loadedDocument.Close(true);
 
//This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("ReplacedFontPDF.pdf");

'Load an existing PDF document
Dim loadedDocument As New PdfLoadedDocument("Input.pdf")
 
'Replace font 
loadedDocument.UsedFonts(0).Replace(New PdfStandardFont(PdfFontFamily.Courier, 12))
 
'Save the document
loadedDocument.Save("ReplacedFontPDF.pdf")
 
'Close the document
loadedDocument.Close(True)
 
'This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("ReplacedFontPDF.pdf")