How to perform Word to PDF conversion in WinForms ?

using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;
using Syncfusion.DocToPDFConverter;
using Syncfusion.Pdf;

//Gets the input Word document as stream from request
Stream stream = req.Content.ReadAsStreamAsync().Result;
//Loads an existing Word document
WordDocument document = new WordDocument(stream);
//Creates an instance of the DocToPDFConverter
DocToPDFConverter converter = new DocToPDFConverter();
//Converts Word document into PDF document
PdfDocument pdfDocument = converter.ConvertToPDF(document);
//Releases the resources occupied by DocToPDFConverter instance
converter.Dispose();
//Closes the Word document
document.Close();
MemoryStream memoryStream = new MemoryStream();
//Saves the PDF file 
pdfDocument.Save(memoryStream);
//Closes the PDF document
pdfDocument.Close();
//Reset the memory stream position
memoryStream.Position = 0;
//Create the response to return
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
//Set the Word document saved stream as content of response
response.Content = new ByteArrayContent(memoryStream.ToArray());
//Set the contentDisposition as attachment
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileName = "DocToPDF.Pdf"
};
//Set the content type as Word document mime type
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
//Return the response with output Word document stream
return response;

//Reads the template Word document.
FileStream fs = new FileStream(@"../../Data/DoctoPDF.docx", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
fs.Position = 0;
//Saves the Word document in memory stream.
MemoryStream inputStream = new MemoryStream();
fs.CopyTo(inputStream);
inputStream.Position = 0;
try
{
    Console.WriteLine("Please enter your Azure Functions URL :");
    string functionURL = Console.ReadLine();
    //Create HttpWebRequest with hosted azure functions URL.    
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(functionURL);
    //Set request method as POST
    req.Method = "POST";
    //Get the request stream to save the Word document stream
    Stream stream = req.GetRequestStream();
    //Write the Word document stream into request stream
    stream.Write(inputStream.ToArray(), 0, inputStream.ToArray().Length);
    //Gets the responce from the Azure Functions.
    HttpWebResponse res = (HttpWebResponse)req.GetResponse();
    //Saves the PDF document stream.
    FileStream fileStream = File.Create("DocToPDF.pdf");
    res.GetResponseStream().CopyTo(fileStream);
    //Dispose the streams
    inputStream.Dispose();
    fileStream.Dispose();
}
catch (Exception ex)
{
    throw;
}