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//install Syncfusion.Pdf.WinForms  NuGet package

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

//Load PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(fileStreamOrFilePath);
 
//Load first page
PdfPageBase page = loadedDocument.Pages[0];
 
//Extract text from first page
string extractedTexts = page.ExtractText(true);
 
//Close the document
loadedDocument.Close(true);