public void DownDile(string url)
{
WebClient client = new WebClient();
string URLAddress = @"https://www.cnblogs.com/images/cnblogs_com/1439107348s/1295915/o_%e5%ad%a4%e7%8b%ac%e7%9a%84%e5%b7%a1%e7%a4%bc.jpg";
string receivePath = @"E:360ALl";
var downx= receivePath+@""+ System.IO.Path.GetFileName(URLAddress);
client.DownloadFile(URLAddress,downx);
}