992492: Added proper code for load and save changes.

Author: sameerkhan001

Digital Signature/Adding-a-timestamp-to-PDF-document/.NET/Adding-a-timestamp-to-PDF-document/Program.cs

@@ -1,27 +1,16 @@
-// See https://aka.ms/new-console-template for more information
-
-using Syncfusion.Pdf;
+using Syncfusion.Pdf;
 using Syncfusion.Pdf.Security;
 
 //Create a new pdf document.
-PdfDocument document = new PdfDocument();
-
-//Adds a new page.
-PdfPage page = document.Pages.Add();
-
-//Creates a digital signature.
-PdfSignature signature = new PdfSignature(page, "Signature");
-
-//Add the time stamp by using the server URI.
-signature.TimeStampServer = new TimeStampServer(new Uri("http://time.certum.pl/"));
-
-//Create file stream.
-using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+using (PdfDocument document = new PdfDocument())
 {
-    //Save the PDF document to file stream.
-    document.Save(outputFileStream);
+    //Adds a new page.
+    PdfPage page = document.Pages.Add();
+    //Creates a digital signature.
+    PdfSignature signature = new PdfSignature(page, "Signature");
+    //Add the time stamp by using the server URI.
+    signature.TimeStampServer = new TimeStampServer(new Uri("http://time.certum.pl/"));
+    //Save the PDF document
+    document.Save(Path.GetFullPath(@"Output/Output.pdf"));
 }
 
-//Close the document.
-document.Close(true);
-

Digital Signature/Adding-a-timestamp-to-an-existing-PDF/.NET/Adding-a-timestamp-to-an-existing-PDF/Program.cs

@@ -1,30 +1,16 @@
-// See https://aka.ms/new-console-template for more information
-
-using Syncfusion.Pdf;
+using Syncfusion.Pdf;
 using Syncfusion.Pdf.Parsing;
 using Syncfusion.Pdf.Security;
 
-//Get stream from an existing PDF document.
-FileStream docStream = new FileStream(Path.GetFullPath(@"Data/Input.pdf"), FileMode.Open, FileAccess.Read);
-
 //Load the PDF document.
-PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
-
-//Gets the page.
-PdfLoadedPage page = loadedDocument.Pages[0] as PdfLoadedPage;
-
-//Creates a digital signature.
-PdfSignature signature = new PdfSignature(page, "Signature");
-
-//Add the time stamp by using the server URI.
-signature.TimeStampServer = new TimeStampServer(new Uri("http://time.certum.pl/"));
-
-//Create file stream.
-using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
 {
-    //Save the PDF document to file stream.
-    loadedDocument.Save(outputFileStream);
+    //Gets the page.
+    PdfLoadedPage page = loadedDocument.Pages[0] as PdfLoadedPage;
+    //Creates a digital signature.
+    PdfSignature signature = new PdfSignature(page, "Signature");
+    //Add the time stamp by using the server URI.
+    signature.TimeStampServer = new TimeStampServer(new Uri("http://time.certum.pl/"));
+    //Save the PDF document 
+    loadedDocument.Save(Path.GetFullPath(@"Output/Output.pdf"));
 }
-
-//Close the document.
-loadedDocument.Close(true);

Digital Signature/Adding-the-estimated-size-of-the-signature/.NET/Adding-the-estimated-size-of-the-signature/Program.cs

@@ -1,32 +1,20 @@
-// See https://aka.ms/new-console-template for more information
-
-using Syncfusion.Drawing;
+using Syncfusion.Drawing;
 using Syncfusion.Pdf;
 using Syncfusion.Pdf.Security;
 
-//Creating a new PDF Document. 
-PdfDocument document = new PdfDocument();
-
-//Adding a new page to the PDF document.
-PdfPageBase page = document.Pages.Add();
-
-//Creates a certificate instance from the PFX file with a private key.
-FileStream certificateStream = new FileStream(Path.GetFullPath(@"Data/PDF.pfx"), FileMode.Open, FileAccess.Read);
-PdfCertificate pdfCert = new PdfCertificate(certificateStream, "syncfusion");
-
-//Add a new signature to the PDF page.
-PdfSignature signature = new PdfSignature(document, page, pdfCert, "Signature");
-signature.Bounds = new Rectangle(10, 20, 400, 200);
-
-//Sets the estimated size of the signature.
-signature.EstimatedSignatureSize = 20000;
-
-//Create file stream.
-using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+//Create a new pdf document.
+using (PdfDocument document = new PdfDocument())
 {
-    //Save the PDF document to file stream.
-    document.Save(outputFileStream);
+    //Adding a new page to the PDF document.
+    PdfPageBase page = document.Pages.Add();
+    //Creates a certificate instance from the PFX file with a private key.
+    FileStream certificateStream = new FileStream(Path.GetFullPath(@"Data/PDF.pfx"), FileMode.Open, FileAccess.Read);
+    PdfCertificate pdfCert = new PdfCertificate(certificateStream, "syncfusion");
+    //Add a new signature to the PDF page.
+    PdfSignature signature = new PdfSignature(document, page, pdfCert, "Signature");
+    signature.Bounds = new RectangleF(10, 20, 400, 200);
+    //Sets the estimated size of the signature.
+    signature.EstimatedSignatureSize = 20000;
+    //Save the PDF document
+    document.Save(Path.GetFullPath(@"Output/Output.pdf"));
 }
-
-//Close the document.
-document.Close(true);

Digital Signature/Check-If-PDF-Is-Signed/.NET/Check-If-PDF-Is-Signed/Program.cs

@@ -1,15 +1,8 @@
-using System;
-using System.IO;
-using System.Reflection.Metadata;
-using Syncfusion.Pdf.Parsing;
+using Syncfusion.Pdf.Parsing;
 
-
-// Open the signed PDF file for reading
-using (FileStream inputFileStream = new FileStream(Path.GetFullPath(@"Data/Input.pdf"), FileMode.Open, FileAccess.Read))
+//Load the PDF document.
+using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
 {
-    // Load the PDF document
-    PdfLoadedDocument loadedDocument = new PdfLoadedDocument(inputFileStream);
-
     // Check if the document contains a form with fields
     if (loadedDocument.Form == null || loadedDocument.Form.Fields.Count == 0)
     {
@@ -32,6 +25,6 @@
             }
         }
     }
-    //Close the document
-    loadedDocument.Close(true);
+    //Save the PDF document 
+    loadedDocument.Save(Path.GetFullPath(@"Output/Output.pdf"));
 }

Digital Signature/Create-LTV-when-signing-PDF-documents-externally/.NET/Create-LTV-when-signing-PDF-documents-externally/Program.cs

@@ -1,75 +1,47 @@
-// See https://aka.ms/new-console-template for more information
-
-using Syncfusion.Pdf;
+using Syncfusion.Pdf;
 using Syncfusion.Pdf.Parsing;
 using Syncfusion.Pdf.Security;
 using System.Security.Cryptography;
 using System.Security.Cryptography.Pkcs;
 using System.Security.Cryptography.X509Certificates;
 
-
-//Get the stream from the document.
-FileStream documentStream = new FileStream(Path.GetFullPath(@"Data/Input.pdf"), FileMode.Open, FileAccess.Read);
-
 //Load an existing PDF document.
-PdfLoadedDocument document = new PdfLoadedDocument(documentStream);
-
-//Get the page of the existing PDF document.
-PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
-
-//Create a new PDF signature without PdfCertificate instance.
-PdfSignature signature = new PdfSignature(document, loadedPage, null, "Signature1");
-
-//Hook up the ComputeHash event.
-signature.ComputeHash += Signature_ComputeHash;
-
-//Save the document into stream
-MemoryStream stream = new MemoryStream();
-document.Save(stream);
-//Close the document
-document.Close(true);
-
-
-//Load an existing PDF stream..
-PdfLoadedDocument loadedDocument = new PdfLoadedDocument(stream);
-
-//Gets the first signature field of the PDF document
-PdfLoadedSignatureField signatureField = loadedDocument.Form.Fields[0] as PdfLoadedSignatureField;
-PdfSignature pdfSignature = signatureField.Signature;
-
-//Create X509Certificate2 from your certificate to create a long-term validity.
-X509Certificate2 x509 = new X509Certificate2(Path.GetFullPath(@"Data/PDF.pfx"), "syncfusion");
-
-//Create LTV with your public certificates.
-pdfSignature.CreateLongTermValidity(new List<X509Certificate2> { x509 });
-
-//Create file stream.
-using (FileStream outputFileStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+using (PdfLoadedDocument document = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
 {
-    //Save the PDF document to file stream.
-    loadedDocument.Save(outputFileStream);
+    //Get the page of the existing PDF document.
+    PdfLoadedPage loadedPage = document.Pages[0] as PdfLoadedPage;
+    //Create a new PDF signature without PdfCertificate instance.
+    PdfSignature signature = new PdfSignature(document, loadedPage, null, "Signature1");
+    //Hook up the ComputeHash event.
+    signature.ComputeHash += Signature_ComputeHash;
+    //Save the document into stream
+    MemoryStream stream = new MemoryStream();
+    document.Save(stream);
+    //Load an existing PDF stream..
+    using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(stream))
+    {
+        //Gets the first signature field of the PDF document
+        PdfLoadedSignatureField signatureField = loadedDocument.Form.Fields[0] as PdfLoadedSignatureField;
+        PdfSignature pdfSignature = signatureField.Signature;
+        //Create X509Certificate2 from your certificate to create a long-term validity.
+        X509Certificate2 x509 = new X509Certificate2(Path.GetFullPath(@"Data/PDF.pfx"), "syncfusion");
+        //Create LTV with your public certificates.
+        pdfSignature.CreateLongTermValidity(new List<X509Certificate2> { x509 });
+        //Save the PDF document.
+        loadedDocument.Save(Path.GetFullPath(@"Output/Output.pdf"));
+    }
 }
-
-//Close the document.
-loadedDocument.Close(true);
-
-
 void Signature_ComputeHash(object sender, PdfSignatureEventArgs ars)
 {
     //Get the document bytes
     byte[] documentBytes = ars.Data;
-
     SignedCms signedCms = new SignedCms(new ContentInfo(documentBytes), detached: true);
-
     //Compute the signature using the specified digital ID file and the password
     X509Certificate2 certificate = new X509Certificate2(Path.GetFullPath(@"Data/PDF.pfx"), "syncfusion");
     CmsSigner cmsSigner = new CmsSigner(certificate);
-
     //Set the digest algorithm SHA256
     cmsSigner.DigestAlgorithm = new Oid("2.16.840.1.101.3.4.2.1");
-
     signedCms.ComputeSignature(cmsSigner);
-
     //Embed the encoded digital signature to the PDF document
     ars.SignedData = signedCms.Encode();
 }

Digital Signature/Customize-the-signed-date/.NET/Customize-the-signed-date/Program.cs

@@ -2,22 +2,19 @@
 using Syncfusion.Pdf.Security;
 using Syncfusion.Drawing;
 
-//Create a new PDF document instance.
-PdfDocument document = new PdfDocument();
-//Add a new page to the PDF document.
-PdfPage page = document.Pages.Add();
-//Create a digital signature and associate it with the added page.
-PdfSignature signature = new PdfSignature(page, "Signature", new DateTime(2020, 12, 24, 10, 50, 10));
-//Set the timestamp server for the digital signature.
-signature.TimeStampServer = new TimeStampServer(new Uri("http://timestamp.digicert.com"));
-//Set the signed name for the signature.
-signature.SignedName = "Test";
-//Define the bounds for the signature (position and size on the page).
-signature.Bounds = new RectangleF(new PointF(0, 0), new SizeF(200, 100));
-//Save the document to a file using a file stream.
-using (FileStream fileStream = new FileStream(Path.GetFullPath(@"Output/Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
+//Create a new pdf document.
+using (PdfDocument document = new PdfDocument())
 {
-    document.Save(fileStream);
-}
-//Close the document to release resources.
-document.Close(true);
+    //Add a new page to the PDF document.
+    PdfPage page = document.Pages.Add();
+    //Create a digital signature and associate it with the added page.
+    PdfSignature signature = new PdfSignature(page, "Signature", new DateTime(2020, 12, 24, 10, 50, 10));
+    //Set the timestamp server for the digital signature.
+    signature.TimeStampServer = new TimeStampServer(new Uri("http://timestamp.digicert.com"));
+    //Set the signed name for the signature.
+    signature.SignedName = "Test";
+    //Define the bounds for the signature (position and size on the page).
+    signature.Bounds = new RectangleF(new PointF(0, 0), new SizeF(200, 100));
+    //Save the PDF document
+    document.Save(Path.GetFullPath(@"Output/Output.pdf"));
+}

Digital Signature/Customized-revocation-validation/.NET/Customized-revocation-validation/Program.cs

@@ -1,33 +1,24 @@
 using Syncfusion.Pdf.Parsing;
 using Syncfusion.Pdf.Security;
 
-//Gets the stream from the document
-FileStream documentStream = new FileStream(Path.GetFullPath(@"Data/Input.pdf"), FileMode.Open, FileAccess.Read);
-
-//Loads an existing signed PDF document
-PdfLoadedDocument document = new PdfLoadedDocument(documentStream);
-
-// Gets the signature field
-PdfLoadedSignatureField signatureField = document.Form.Fields[0] as PdfLoadedSignatureField;
-
-// Signature validation options
-PdfSignatureValidationOptions options = new PdfSignatureValidationOptions();
-
-// Sets the revocation type
-options.RevocationValidationType = RevocationValidationType.Crl;
-
-// Validate signature and get validation result
-PdfSignatureValidationResult result = signatureField.ValidateSignature(options);
-
-//Check whether the CRL is revoked
-if (result.RevocationResult.IsRevokedCRL)
+//Load the PDF document.
+using (PdfLoadedDocument loadedDocument = new PdfLoadedDocument(Path.GetFullPath(@"Data/Input.pdf")))
 {
-    Console.WriteLine("CRL is revoked");
-}
-else
-{
-    Console.WriteLine("CRL is not revoked");
-}
-
-// Closes the document
-document.Close(true);
+    // Gets the signature field
+    PdfLoadedSignatureField signatureField = loadedDocument.Form.Fields[0] as PdfLoadedSignatureField;
+    // Signature validation options
+    PdfSignatureValidationOptions options = new PdfSignatureValidationOptions();
+    // Sets the revocation type
+    options.RevocationValidationType = RevocationValidationType.Crl;
+    // Validate signature and get validation result
+    PdfSignatureValidationResult result = signatureField.ValidateSignature(options);
+    //Check whether the CRL is revoked
+    if (result.RevocationResult.IsRevokedCRL)
+    {
+        Console.WriteLine("CRL is revoked");
+    }
+    else
+    {
+        Console.WriteLine("CRL is not revoked");
+    }
+}