I have an application and I need to convert a file DOCX to PDF without losing the formatting.
I found some DLLs that help, but for corporate use you have to buy licenses so it gets tricky.
Complementing I did some more research and found some posts that use Microsoft.Office.Interop.Word
It is very easy to use the Microsoft.Office.Interop.Word library to convert to PDF.
However, it is necessary for MS-Word to be installed on the machine where the application will run.
An example code in C# to do the conversion is as follows:
string arqDoc = @"C:\Desenv\DocTeste.docx";
string arqPdf = @"C:\Desenv\DocTeste.pdf";
var appWord = new Microsoft.Office.Interop.Word.Application();
var wordDocument = appWord.Documents.Open(arqDoc);
wordDocument.ExportAsFixedFormat(arqPdf, Microsoft.Office.Interop.Word.WdExportFormat.wdExportFormatPDF);
wordDocument.Close();