Why we need Codedworkflows.cs file

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Is there any other option to exe file? I tried with invoke code activity but it need itextsharp package installed in project & itextsharp is not compatible with windows projects @Anil_G @Sudharsan_Ka
This is the code

using System;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace PdfManipulate
{
    class PdfImageAdder
    {
        static void Main(string[] args)
        {
            if (args.Length != 4)
            {
                Console.WriteLine("Usage: PdfImageAdder <inputFilePath> <outputFilePath> <imagePath> <text>");
                return;
            }

            string inputFilePath = args[0]; // Existing file
            string outputFilePath = args[1]; // New file
            string imagePath = args[2]; // Image to be added
            string text = args[3]; // Text to be added

            using (FileStream fos = new FileStream(outputFilePath, FileMode.Create))
            {
                PdfReader pdfReader = new PdfReader(inputFilePath);
                PdfStamper pdfStamper = new PdfStamper(pdfReader, fos);

                //Image to be added in existing pdf file.
                Image image = Image.GetInstance(imagePath);
                image.ScaleAbsolute(70, 50); //Scale image's width and height

                // Font for text
                Font font = FontFactory.GetFont(FontFactory.HELVETICA, 12, Font.NORMAL, BaseColor.BLACK);
                Font font1 = FontFactory.GetFont(FontFactory.HELVETICA, 8, Font.NORMAL, BaseColor.BLACK);
                // Date to be added in existing pdf file
                DateTime date = DateTime.Now;
                string formattedDate = date.ToString("dd MMM yyyy");
                
                if(pdfReader.NumberOfPages > 3){
                    pdfReader.SelectPages("4-6");
                }

                // loop on all the PDF pages
                // i is the pdfPageNumber
                for (int i = 1; i <= pdfReader.NumberOfPages; i++)
                {
                    //getOverContent() allows you to write pdfContentByte on TOP of existing pdf pdfContentByte.
                    //getUnderContent() allows you to write pdfContentByte on BELOW of existing pdf pdfContentByte.
                    PdfContentByte pdfContentByte = pdfStamper.GetOverContent(i);

                    if (i == 1)
                    {
                        // add image
                        image.SetAbsolutePosition(130, 35); //Set position for image in PDF
                        pdfContentByte.AddImage(image);

                        // add text
                        ColumnText.ShowTextAligned(pdfContentByte, Element.ALIGN_LEFT, new Phrase(text, font), 80, 40, 0);

                        // add date
                        ColumnText.ShowTextAligned(pdfContentByte, Element.ALIGN_LEFT, new Phrase(formattedDate, font1), 60, 60, 0);
                    }
                    else
                    {
                        // add image
                        image.SetAbsolutePosition(230, 35); //Set position for image in PDF
                        pdfContentByte.AddImage(image);

                        // add text
                        ColumnText.ShowTextAligned(pdfContentByte, Element.ALIGN_LEFT, new Phrase(text, font), 90, 36, 0);

                        // add date
                        ColumnText.ShowTextAligned(pdfContentByte, Element.ALIGN_LEFT, new Phrase(formattedDate, font1), 65, 67, 0);
                    }

                    Console.WriteLine("Image, Date and Text added in page " + i + " of " + outputFilePath);
                }

                pdfStamper.Close();
                Console.WriteLine("Modified PDF created in >> " + outputFilePath);
            }
        }
    }
}`
Getting error while publishing UiPath packages