How to sign a document automatically without the use of sign setup in Microsoft word using C#

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C#

ASP.NET

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;
 objSignature.attachcertificate();
 objSignature.sign();
          //  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); }
  }

What I have tried:

here im attaching my own certificate when trying to open that it will show some setup popup instead i need to automatically get sign

objSignature.attachcertificate();
 objSignature.sign();