How to connect to a ftp server in visual studio 2015?

Sorry about that

CS0246 The type or namespace name 'FtpWebRequest' could not be found (are you missing a using directive or an assembly reference?)

Here's my code

using System;
using System.IO;
using System.Net;
using System.Text;

namespace TCRSJobs.Jobs.FileImport.FTP
{
public class WebRequestGetExample
{
public static void Main()
{
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://www.contoso.com/");
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails;

// This example assumes the FTP site uses anonymous logon.
request.Credentials = new NetworkCredential("anonymous", "janeDoe@contoso.com");

FtpWebResponse response = (FtpWebResponse)request.GetResponse();

Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
Console.WriteLine(reader.ReadToEnd());

Console.WriteLine("Directory List Complete, status {0}", response.StatusDescription);

reader.Close();
response.Close();
}
}
}

Same goes for 'FtpWebResponse'