Replace text in the document

DocxConverter.cs

using System;
using System.IO;
using Spire.Doc;
using Spire.Doc.Documents;

namespace doc_to_text
{
    public class DocxConverter
    {
        public enum OutputFormat
        {
            Text,
            Xml,
            Pdf
        }

        public static void ConvertDocx(string inputPath, string outputPath, OutputFormat format, string textToReplace = null, string replacementText = null)
        {
            try
            {
                if (!File.Exists(inputPath))
                {
                    throw new FileNotFoundException("Input file not found.", inputPath);
                }

                Document document = new Document();
                document.LoadFromFile(inputPath);

                if (!string.IsNullOrEmpty(textToReplace) && !string.IsNullOrEmpty(replacementText))
                {
                    // Replace text in the document
                    document.Replace(textToReplace, replacementText, true, true);
                }

                FileFormat saveFormat;
                switch (format)
                {
                    case OutputFormat.Text:
                        saveFormat = FileFormat.Txt;
                        break;
                    case OutputFormat.Xml:
                        saveFormat = FileFormat.Docx2019;
                        break;
                    case OutputFormat.Pdf:
                        saveFormat = FileFormat.PDF;
                        break;
                    default:
                        throw new ArgumentException("Unsupported output format.");
                }

                document.SaveToFile(outputPath, saveFormat);

                Console.WriteLine($"Conversion complete. File saved to {outputPath}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"An error occurred: {ex.Message}");
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // Convert to PDF and replace text
            DocxConverter.ConvertDocx(
                "input.docx",
                "output.pdf",
                DocxConverter.OutputFormat.Pdf,
                "$cs_1_alpha_2$",
                "EDITED"
            );
        }
    }
}