Save file in selected location

Question

On site (ASP.NET) i have table with items. Every item has link to specific pdf. This pdf i generate from binary data that are saved in database. So realy, i don't have path to pdf file. When i click on link, i want to download file. And this functionallity work fine. But i download file to default location that use browser (By default it's C:\Users\Admin\Documents)

What should i do to make browser show save dialog where user can chose destination path for pdf?

Code to generate pdf file :

private void ProcessFile(byte[] file, string fileName)
    {
        Response.Clear();
        Response.ContentType = "application/pdf";
        Response.AddHeader("Content-Disposition",
            string.Format("attachment;filename=\"{0}\"", fileName));

        Response.BinaryWrite(file);

        Response.Flush();
        Response.End();
    }

---

About my code : i'm going to rewrite a bit it according to this post