Add digital signature to word document using C#

Question

I'm building an application for adding digital signature to word file, for that i'm using below code.

    private void CreateNewPage()
    {
        object missing = System.Reflection.Missing.Value;
        object fileName = @"F:\Doc\test.docx";
        object readOnly = false;
        object isVisible = true;

        //Start Word and open a document.  
        Microsoft.Office.Interop.Word._Application oWord;
        Microsoft.Office.Interop.Word._Document oDoc;
        oWord = new Microsoft.Office.Interop.Word.Application();
        oWord.Visible = true;

        oDoc = oWord.Documents.Open(ref fileName, ref missing, ref readOnly,
            ref missing, ref missing, ref missing, ref missing, ref missing,
            ref missing, ref missing, ref missing, ref isVisible, ref missing,
            ref missing, ref missing, ref missing);

        //  var numberOfPages = oDoc.ComputeStatistics(Word.WdStatistic.wdStatisticPages, false);

        object oEndOfDoc = "\\endofdoc";
        object paramNextPage = Microsoft.Office.Interop.Word.WdBreakType.wdSectionBreakNextPage;

        oDoc.Bookmarks.get_Item(ref oEndOfDoc).Range.InsertBreak(ref paramNextPage);
        //Insert a page break  
        object breakPage = Microsoft.Office.Interop.Word.WdBreakType.wdPageBreak;


        object saveOption = Microsoft.Office.Interop.Word.WdSaveOptions.wdDoNotSaveChanges;
        object originalFormat = Microsoft.Office.Interop.Word.WdOriginalFormat.wdOriginalDocumentFormat;
        object routeDocument = false;

        object what = Microsoft.Office.Interop.Word.WdGoToItem.wdGoToPage;
        object which = Microsoft.Office.Interop.Word.WdGoToDirection.wdGoToLast;
        object count = 3;

        oWord.Selection.GoTo(ref what, ref which, ref count, ref missing);

        object sigID = "{00000000-0000-0000-0000-000000000000}";
      

        try
        {
            oWord.Activate();

            SignatureSet signatureSet = oWord.ActiveDocument.Signatures;
            // signatureSet.ShowSignaturesPane = false;
            Signature objSignature = signatureSet.AddSignatureLine(sigID);
            objSignature.Setup.SuggestedSigner = "docSigner";
            objSignature.Setup.SuggestedSignerEmail = "abc@xyz.com";
            objSignature.Setup.ShowSignDate = true;
            //  dynamic shape = objSignature.SignatureLineShape;
        }
        catch (Exception ex) { MessageBox.Show(ex.Message); }

        oWord.Documents.Save();
        oWord.Quit();

        try
        {
            Marshal.ReleaseComObject(oWord);
        }
        catch (Exception e) { MessageBox.Show(e.Message); }
    }

But i'm encountered an error at below location :

Line

SignatureSet signatureSet = oWord.ActiveDocument.Signatures;

Error

Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED))

Can any one having any idea, how to solve this issue. Or have any other solution to adding signature into Word/PDF file.

According to [this question](http://stackoverflow.com/questions/2347529/outlook-2007-from-c-sharp-com-exception-type-e-libnotregistered): "This can also happen, when you have uninstalled an office 2013 installation and you return to office 2010". Is this your case? — Daniel Marín, Feb 01 '17 at 10:18
Sorry, but can't find the "SignatureSet" class. Is that from an external library or package? — Daniel Marín, Feb 01 '17 at 12:15
It is an `Interface` under `Microsoft.Office.Core` name space. — Ashish Rathore, Feb 01 '17 at 13:19

score -3 · Answer 1 · answered Sep 25 '19 at 10:31

Or have any other solution to adding signature into Word/PDF file.

As an alternative solution, you can use GroupDocs.Signature for .NET API to add digital signatures to Word or PDF documents.

 using (Signature signature = new Signature("sample.docx"))
 {    
     // initialize digital option with certificate file path
     DigitalSignOptions options = new DigitalSignOptions("certificate.pfx")
     {
         // optional: setup image file path
         ImageFilePath = "sample.jpg",
         // set signature position
         Left = 100,
         Top = 100,   
         // set password
         Password = "1234567890"
     };
     signature.Sign("sampleSigned.docx", options);
 }

See this article for more details.

Disclosure: I work as a developer evangelist at GroupDocs.

Add digital signature to word document using C#

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Error

1 Answers1