How to upload/download file from FTP Server in Asp.net

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Net;

public partial class Default2 : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    // Upload file

    protected void btnUpload_Click(object sender, EventArgs e)

    {

        //fileName = Name of the file to be downloaded from FTP server.

        string fileName = "test.txt";

        //filePath = The full path where the file is to be created. Here i put local system path.

        string filePath = "C:\\FTP";

        string ftpServerIP = "IP Address";

        string ftpUserID = "User ID";

        string ftpPassword = "Password";

        FtpWebRequest reqFTP;

        try

        {

            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(ftpUserID, ftpPassword);

            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)

        {

            string errMsg = (ex.Message);

        }

    }

   

    // Download file

    protected void btnDownload_Click(object sender, EventArgs e)

    {

        string filename = "c:\\test.txt";

        string ftpServerIP = "IP address";

        string ftpUserID = "User ID";

        string ftpPassword = "Password";

        FileInfo fileInf = new FileInfo(filename);

        string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

        FtpWebRequest reqFTP;

        // Create FtpWebRequest object

        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + fileInf.Name));

        //Provide ftp userid and password

        reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

        // By default KeepAlive is true, where the control connection is not closed

        // after a command is executed.

        reqFTP.KeepAlive = false;

        //Specify the command to be executed. Here we use upload file command

        reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

        //data transfer type we use here is binary

        reqFTP.UseBinary = true;

        // Notify the server about the size of the uploaded file

        reqFTP.ContentLength = fileInf.Length;

        // The buffer size is set to 2kb

        int buffLength = 2048;

        byte[] buff = new byte[buffLength];

        int contentLen;

        // Opens a file stream (System.IO.FileStream) to read the file to be uploaded

        FileStream fs = fileInf.OpenRead();

        try

        {

            // Stream to which the file to be upload is written

            Stream strm = reqFTP.GetRequestStream();

            // Read from the file stream 2kb at a time

            contentLen = fs.Read(buff, 0, buffLength);

            // Till Stream content ends

            while (contentLen != 0)

            {

                // Write Content from the file stream to the FTP Upload Stream

                strm.Write(buff, 0, contentLen);

                contentLen = fs.Read(buff, 0, buffLength);

            }

            // Close the file stream and the Request Stream

            strm.Close();

            fs.Close();

        }

        catch (Exception ex)

        {

            string ErrMsg = ex.Message;

        }

    }

}