Go FTP operation class, downloading files from FTP

Using system;using system.collections.generic;using system.text;using system.io;using System.Net;using System.windows.forms;namespace pcmdataimporter{///<summary>//Package Two operations for ftp: Download file download () and get file list information on FTP server G        Etfilelist ()///</summary> public class Ftpoperater {private string Ftpserverip;        private string Ftpuser;        private string ftppwd;        Private Systemparareader spreader;            Public Ftpoperater () {spreader = new Systemparareader ();            This.ftpserverip = Spreader.getsysparavalue ("Ftpserver");            This.ftpuser = Spreader.getsysparavalue ("Ftpuser");        This.ftppwd = Spreader.getsysparavalue ("Ftppwd"); }///<summary>//Get the file information on the FTP server///</summary>//<returns> A string that stores all file information            Array </returns> public string[] Getfilelist () {string[] downloadfiles;         StringBuilder result = new StringBuilder ();   FtpWebRequest reqftp;                try {reqftp = (ftpwebrequest) ftpwebrequest.create (New Uri ("ftp://" + Ftpserverip + "/"));                Reqftp.usebinary = true;                Reqftp.credentials = new NetworkCredential (Ftpuser, ftppwd);                Reqftp.method = WebRequestMethods.Ftp.ListDirectory;                WebResponse response = Reqftp.getresponse (); StreamReader reader = new StreamReader (response.                GetResponseStream ()); String line = reader.                ReadLine (); while (line! = null) {result.                    Append (line); Result.                    Append ("\ n"); line = reader.                ReadLine (); } result. Remove (result. ToString ().                LastIndexOf (' \ n '), 1); Reader.                Close (); Response.                Close (); return result. ToString ().            Split (' \ n '); } catch (Exception ex) {system.windows.Forms.MessageBox.Show ("Get File information failed:" +ex.                Message, "Operation failed", Messageboxbuttons.ok,messageboxicon.error);                Downloadfiles = null;            return downloadfiles; }}///<summary>//Get the size of the specified file on FTP///</summary>//<param name= "file        Name "> File name </param>//<returns> File size </returns> public long getfilesize (string filename)            {FtpWebRequest reqftp;            Long fileSize = 0; try {reqftp = (ftpwebrequest) ftpwebrequest.create (New Uri ("ftp://" + Ftpserverip + "/" + Filena                Me));                Reqftp.method = WebRequestMethods.Ftp.GetFileSize;                Reqftp.usebinary = true;                Reqftp.credentials = new NetworkCredential (Ftpuser, ftppwd);                FtpWebResponse response = (ftpwebresponse) reqftp.getresponse (); Stream FtpStream = Response.                GetResponseStream (); FileSize = Response. ContEntlength;                Ftpstream.close (); Response.            Close (); } catch (Exception ex) {MessageBox.Show ("an exception occurred when getting file size: \ n" + ex.) Message, "Get File size failed!"            ", MessageBoxButtons.OK, Messageboxicon.error);        } return fileSize; }///<summary>//To implement FTP download operation///</summary>//<param name= "FilePath" > Save to this Name of the ground </param>//<param name= "filename" > Remote file name </param> public void Download (string filepat            H, String fileName) {FtpWebRequest reqftp;                 try {//filepath = <<the full path where the file was to be created.>>                FileName = <<name of the file to being created (need not being the Name of the the file on FTP server) .>>                FileStream outputstream = new FileStream (filePath + "\ \" + FileName, FileMode.Create); Reqftp = (ftpwebrequest) FtpWebRequest.Create (New Uri ("ftp://" + Ftpserverip + "/" + fileName);                Reqftp.method = WebRequestMethods.Ftp.DownloadFile;                Reqftp.usebinary = true;                Reqftp.credentials = new NetworkCredential (Ftpuser, ftppwd);                FtpWebResponse response = (ftpwebresponse) reqftp.getresponse (); Stream FtpStream = Response.                GetResponseStream (); Long cl = Response.                ContentLength;                int buffersize = 2048;                int readcount;                byte[] buffer = new Byte[buffersize];                Readcount = ftpstream.read (buffer, 0, buffersize);                    while (Readcount > 0) {outputstream.write (buffer, 0, readcount);                Readcount = ftpstream.read (buffer, 0, buffersize);                } ftpstream.close ();                Outputstream.close (); Response.            Close ();   } catch (Exception ex) {             MessageBox.Show (ex.            Message); }        }    }}

Go FTP operation class, downloading files from FTP