Download a folder to your computer

In C # to download a file, use the code:

using System.Net;
void Baixar(string url, string saida)
{
    WebClient wc=new WebClient();
    wc.DownloadFileAsync(new Uri(url), saida);
}

So far I have not found any well-explained code regarding downloading folders from a server.

O.B.S .: When I use this same code, the application does not report any effects and the location where the files should be downloaded remains the same.