sample code to download files from ftp server by checking dates in c# using REBEX

Try this code sample
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public void DownloadFile(string ftppath, string destfile,string strFileName)
    {
        try
        {
            //create ftp object
            FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftppath);
            //userid and password for the ftp server
            ftp.Credentials = new NetworkCredential("ftp_username", "ftp_password");
            //Set keepalive property true to multiple use of same instance 
            ftp.KeepAlive = true;
            //use binary method to upload data
            ftp.UseBinary = true;
            //set action to check the date and time of ftp file
            ftp.Method = WebRequestMethods.Ftp.GetDateTimestamp;
             FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
            //recieve ftp file date time
            DateTime modification = response.LastModified;
 
            // Download the data
             string sBackupFileName = strFileName + modification.ToString("MM_dd_yyyy") + "_" + modification.Hour.ToString() + "_" + modification.Minute.ToString() + "_" + modification.Second.ToString() + ".xml";
            //download file in byte , for this call another user defined method given in this post
            byte[] Data = DownloadData(ftppath);
 
            // Save the data to disk
            FileStream fs = new FileStream(destfile + sBackupFileName, FileMode.Create);
 
            fs.Write(Data, 0, Data.Length);
            //close the file stream
            fs.Close();
        }
        catch (Exception ex)
        {
            //exception handling
            throw;
        }
 
    }

For Reference

More info
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http://www.vcskicks.com/download-file-ftp.php

http://blogs.techrepublic.com.com/howdoi/?p=165