unable to download http file

I would thank you if you help me with the next subject:

I tried to download http file to c drive, but it did not work.

Here is the code I wrote :

Code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;

namespace t2
{
    class Program
    {
        static void Main(string[] args)
        {
            WebRequestMethods.File.DownloadFile("http://www.eng.tau.ac.il/students/forms/t4.pdf", "c:");
        }
    }
}

 

Please read the documentation properly, it says that WebRequestMethods.File.DownloadFile doesn't have a 2nd parameter!