using System;

using System.Net;

using iTextSharp.text.pdf;

​

public class Program

{

    public static void Main()

    {

        using (var client = new WebClient())

        {

            client.DownloadFile("http://www.istanbulsaglik.gov.tr/w/tez/pdf/psikiyatri/dr_isilay_yatkin.pdf", "test.pdf");

        }

​

        PdfReader reader = new PdfReader("test.pdf");

        Console.Write(reader.Info["Author"]);

    }

}