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C# PDF Document Process Library
How to add, remove, update PDF file digital signatures using C#.net


C# Solutions for Improving the Security of Your PDF File by Adding Digital Signatures in Visual C#.NET Class










  • Best .NET framework PDF SDK library for PDF signature manipulation in Visual C# .NET WinForms and ASP.NET WebForm project
  • Provide free PDF signing application component to add signature to PDF file in C#.NET project
  • Able to use online C# source code to create a signature for PDF document in Visual Studio .NET program
  • Support .NET WinForms, ASP.NET MVC in IIS, ASP.NET Ajax, Azure cloud service, DNN (DotNetNuke), SharePoint
  • Able to digitally sign a PDF file without adobe reader installed
  • Add a signature or an empty signature field in any PDF file page
  • Ability to insert signature in PDF form
  • Detect and search signature field in PDF document
  • Insert PDF signature certificate to sign PDF file
  • Verify the validity of PDF signature
  • Remove signature from PDF document




C# add digital signature to PDF document


        #region add digital signature to PDF document
        internal static void addDigitalSignature()
        {
            String inputFilePath = @"...";
            String outputFilePath = @"...";
            String imagePath = @"...";
            String certSubjectName = @"...";
            String fieldID = @"...";

            X509Cert cert = PDFDigitalSignatureHandler.MakeCert(StoreName.My, StoreLocation.CurrentUser, certSubjectName);

            // Set cert properties.
            cert.Location = "CHINA SHANGHAI";
            cert.Reason = "Reason";
            cert.APMode = APMode.Text; // APMode.Text | APMode.Image.
            cert.Image = new Bitmap(imagePath);

            if (PDFDigitalSignatureHandler.Sign(inputFilePath, outputFilePath, cert, fieldID) == 0)
            {
                Console.WriteLine("[SUCCESS]");
            }
            else
            {
                Console.WriteLine("[FAILED]");
            }
        }
        #endregion




C# search unsigned signature field in the PDF document


String inputFilePath = @"...";
List<SignatureField> vals = PDFDigitalSignatureHandler.SearchUnsignedFields(inputFilePath);
if (vals == null || vals.Count == 0)
{
    Console.WriteLine("No Signature Field");
}
else
{
    Console.WriteLine("Signature Fields");

    for (int i = 0; i < vals.Count; i++)
    {
        Console.WriteLine(i + ": " + vals[i].ID + " (Pg " + vals[i].PageIndex + ")");
    }
}




C# prepare a certification which used to sign a document


StoreName storeName = StoreName.My;
StoreLocation storeLocation = StoreLocation.CurrentUser;
String subjectName = "";

List<String> allSubjects = PDFDigitalSignatureHandler.GetAllSubjectNames(storeName, storeLocation, true);
foreach (String str in allSubjects)
{
    Console.WriteLine("Make certification by name: " + str);
    X509Cert cert = PDFDigitalSignatureHandler.MakeCert(storeName, storeLocation, str);

//	
}




C# add an empty signature field to pdf document


String inputFilePath = @"...";
String outputFilePath = @"...";

PDFSignature signature = new PDFSignature(new RectangleF(10F, 10F, 250F, 150F));
if (PDFDigitalSignatureHandler.CreateSignatureField(inputFilePath, outputFilePath, signature, 0) == 0)
{
    Console.WriteLine("[SUCCESS]");
}
else
{
    Console.WriteLine("[FAILED]");
}




C# sign a PDF document


String inputFilePath = @"...";
String outputFilePath = @"...";
String imagePath = @"...";
String certSubjectName = @"...";
String fieldID = @"...";

X509Cert cert = PDFDigitalSignatureHandler.MakeCert(StoreName.My, StoreLocation.CurrentUser, certSubjectName);
//  set cert properties
cert.Location = "CHINA SHANGHAI";
cert.Reason = "Reason";
cert.APMode = APMode.Text;      //  APMode.Text | APMode.Image
cert.Image = new Bitmap(imagePath);

if (PDFDigitalSignatureHandler.Sign(inputFilePath, outputFilePath, cert, fieldID) == 0)
{
    Console.WriteLine("[SUCCESS]");
}
else
{
    Console.WriteLine("[FAILED]");
}