WebClient上传文件至FTP

 var client = new WebClient();  
    //ftp地址        
 client.BaseAddress = @"ftp://192.168.999.999"; 

//用户名密码
 client.Credentials = new NetworkCredential("user100", "123456");

//上传ftp路径
 string ftpPath = "ftp://192.168.999.999/tsk/ink/libing/2.txt";

 try
 {
 //此处注意，
 //ftpPath参数，一定要指定文件名，不然报错
　　//达到的效果就是111.txt的内容会替换2.txt的内容
    client.UploadFile(ftpPath,"E:\FileTest\111.txt");
 }
 catch (Exception ex)
 {
    Console.WriteLine(ex.Message);
 }