从需要登录的URL下载文件

我正在尝试从Etsy下载。csv文件，我不知道为什么它不工作，只是写

StreamReader reader = new StreamReader(WebRequest.Create("https://www.etsy.com/se-en/your/orders/sold.csv?csv-type=transaction-level&month=&year=2016").GetResponse().GetResponseStream());
string line;
while ((line = reader.ReadLine()) != null)
{
Console.WriteLine(line);
}

还是

StreamReader reader = new StreamReader(WebRequest.Create("https://www.etsy.com/se-en/your/orders/sold.csv").GetResponse().GetResponseStream());
string line;
while ((line = reader.ReadLine()) != null)
{
Console.WriteLine(line);
}

我也试过使用

using (var client = new WebClient())
{
client.Credentials = new NetworkCredential("login", "password");
client.DownloadFile("https://www.etsy.com/se-en/your/orders/sold.csv", @"c:'sold.csv");
}

但是它一直给我http