Create dynamic pdf file without third party library in ASP.Net

How to create dynamic pdf without using any 3rd party dll

i used below code but my file not created

here result is byte type variable

Dim response As HttpResponse = HttpContext.Current.Response
response.ContentType = "application/pdf"
response.Clear()
response.AddHeader("Content-Disposition", $"attachment; filename\abc.pdf")
response.ContentType = "application/pdf"
response.Buffer = True
response.Cache.SetCacheability(HttpCacheability.NoCache)
response.OutputStream.Write(result, 0, result.Length)
response.OutputStream.Close()