how to download multiple files from ftp server to local folder

i want to download multiple files from ftp server to local folder....
FtpWebRequest reqFTP;
try
{
//filePath = <<The full path where the file is to be created.>>,
//fileName = <<Name of the file to be created(Need not be the name of the file on FTP server).>>
FileStream outputStream = new FileStream(filePath + "\\" + fileName, FileMode.Create);

reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + txtip + "/" + fileName));
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
//reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(txtuser.Text.ToString(), txtpass.Text.ToString());
FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream ftpStream = response.GetResponseStream();
long cl = response.ContentLength;
int bufferSize = 2097151;
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);
}
}


private void button1_Click(object sender, EventArgs e)
{
FolderBrowserDialog fldDlg = new FolderBrowserDialog();
if (txtupload.Text.Trim().Length > 0)
{
if (fldDlg.ShowDialog() == DialogResult.OK)
{
Download(fldDlg.SelectedPath, txtupload.Text.Trim());
}
}
else
{
MessageBox.Show("Please enter the File name to download");
}

}
i tried with the above code but only single file is downloading i need to download multiple files....