[Solved] ASP.Net download file from FTP Server Error: Specified method is not supported

Hi namojainashis...,

Use below code.

protected void OnDownload(object sender, EventArgs e)
{
    string fileName = (sender as LinkButton).CommandArgument;

    string ftp = "FTP://12.2.22.12";

    string ftpFolder = "Uploadfolder";
    try
    {
        //Create FTP Request.
        FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftp + ftpFolder + fileName);
        request.Method = WebRequestMethods.Ftp.DownloadFile;
        //Enter FTP Server credentials.
        request.Credentials = new NetworkCredential(userName, password);
        //request.Credentials = new NetworkCredential("Username", "Password");
        request.UsePassive = true;
        request.UseBinary = true;
        request.EnableSsl = false;

        //Fetch the Response and read it into a MemoryStream object.
        FtpWebResponse response = (FtpWebResponse)request.GetResponse();

        using (MemoryStream stream = new MemoryStream())
        {
            ////Download the File.
            CopyStream(response.GetResponseStream(), stream);
            Response.AddHeader("content-disposition", "attachment;filename=" + fileName);
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.BinaryWrite(stream.ToArray());
            Response.End();
        }
    }
    catch (WebException ex)
    {
        FtpWebResponse response = (FtpWebResponse)ex.Response;
    }
}

public static void CopyStream(Stream input, Stream output)
{
    byte[] buffer = new byte[1024];
    while (true)
    {
        int read = input.Read(buffer, 0, buffer.Length);
        if (read <= 0)
        {
            return;
        }
        output.Write(buffer, 0, read);
    }
}