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Код

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        static void Main(string[] args)
        {
            ftpfile("/qwerty.txt", "C:\\qwerty.txt");  
        }

        public static void ftpfile(string ftpfilepath, string inputfilepath)
        {
            string ftphost = "ftp.host.com";

            string ftpfullpath = "ftp://" + ftphost + ftpfilepath;
            FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpfullpath);
            ftp.Credentials = new NetworkCredential("user", "pass");

            ftp.KeepAlive = true;
            ftp.UseBinary = true;
            ftp.Proxy = null;
            ftp.Method = WebRequestMethods.Ftp.UploadFile;
            FileStream fs = File.OpenRead(inputfilepath);
            byte[] buffer = new byte[fs.Length];
            fs.Read(buffer, 0, buffer.Length);
            fs.Close();
            Stream ftpstream = ftp.GetRequestStream();
            ftpstream.Write(buffer, 0, buffer.Length);
            ftpstream.Close();
        }
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