Build itextsharp dll Lite

Hi all,

I use iTextSharp in my projet to generate pdf. Yet, when I read the editor log, I see that it use 1Mb on my initial Scene.

With iTextSharp dll : Level 0 'Assets/Scenes/Boot.unity' uses 1.5 MB compressed / 7.3 MB uncompressed.

without iTextSharp dll : Level 0 'Assets/Scenes/Boot.unity' uses 477.0 KB compressed / 3.3 MB uncompressed.

But, I don't know how to build custom dll with classes I want. I do that class in a empty monodevelop project :

 using System;
 
 namespace Application
 {
     public class MyClass
     {
         
         public static void main() {
             // Only classes I want
             iTextSharp.text.Document test;
             iTextSharp.text.pdf.PdfWriter tt ;
             iTextSharp.text.pdf.codec.PngImage ss ;
             iTextSharp.text.Image ee ;
             iTextSharp.text.pdf.ColumnText cc ;
             iTextSharp.text.Phrase pp ;
             iTextSharp.text.Font ff ;
             iTextSharp.text.pdf.BaseFont bb ;
             iTextSharp.text.BaseColor bc ;
             iTextSharp.text.FontFactory fd ;
             iTextSharp.text.Chunk cd ;
         }
     }
 }

I suppose that building a dll with MyClass will include all classes needed.

Now, I don't know build my dll. Someone ?