Download File From FTP With Sub-Directories Using C#

When I got the task to download the files from FTP with subdirectories, I searched many articles and many posts for the sample code but I get partially. i.e only download the file by giving end path, as shown below (FTPaddress/Directory/Sub-Dir1/Sub-Dir2/Sub-Dir3/Filename.zip) but I want to download the file by giving only this (FTPaddress/Directory). After the hours of work, I got the output. I want to share the code. I think, it will help the people while they struggle in this part.

Let's enter into the code.

public void DownloadFile() {
    string dirpath = txtlocalpath.Text;
    try {
        FtpWebRequest ftpRequest = (FtpWebRequest) WebRequest.Create("ftp://xxx.xxx.xx.xx/"); // FTP Address
        ftpRequest.Credentials = new NetworkCredential(txtusername.Text, txtpassword.Text); // Credentials
        ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
        FtpWebResponse response = (FtpWebResponse) ftpRequest.GetResponse();
        StreamReader streamReader = new StreamReader(response.GetResponseStream());
        List < string > directories = new List < string > (); // create list to store directories.
        string line = streamReader.ReadLine();
        while (!string.IsNullOrEmpty(line)) {
            directories.Add(line); // Add Each Directory to the List.
            line = streamReader.ReadLine();
        }
        using(WebClient ftpClient = new WebClient()) {
            ftpClient.Credentials = new NetworkCredential(txtusername.Text, txtpassword.Text);
            string[] filename = txtftpaddress.Text.Split('/');
            Filename = filename[filename.Length - 1];
            for (int k = 0; k <= filename.Length - 1; k++) {
                dirpath = dirpath + "\\" + filename[k];
                createdir(dirpath);
            }
            try {
                for (int i = 0; i <= directories.Count - 1; i++) {
                    if (directories[i].Contains(".")) {
                        string path = "ftp://xxx.xxx.xx.xx//" + txtftpaddress.Text + "/" + directories[i].ToString();
                        ftpClient.DownloadFile(path, dirpath.ToString() + "\\" + directories[i].ToString());
                    } else {
                        string path = "ftp://xxx.xxx.xx.xx//" + txtftpaddress.Text + "/" + directories[i].ToString();
                        string subdirpath = dirpath + "\\" + directories[i].ToString();
                        createdir(subdirpath);
                        string[] subdirectory = Return(path, txtusername.Text, txtpassword.Text);
                        for (int j = 0; j <= subdirectory.Length - 1; j++) {
                            string subpath = directories[i] + "/" + subdirectory[j];
                            directories.Add(subpath); // Add the Sub-directories with the path to directories.
                        }
                    }
                }
            } catch (WebException e) {
                String status = ((FtpWebResponse) e.Response).StatusDescription;
                MessageBox.Show(status.ToString());
            }
        }
        streamReader.Close();
    } catch (WebException l) {
        String status = ((FtpWebResponse) l.Response).StatusDescription;
        MessageBox.Show(status.ToString());
    }
}
// Here i get the list of Sub-directories and the files.
public string[] Return(string filepath, string username, string password) {
    List < string > directories = new List < string > ();
    try {
        FtpWebRequest ftpRequest = (FtpWebRequest) WebRequest.Create(filepath);
        ftpRequest.Credentials = new NetworkCredential(username, password);
        ftpRequest.Method = WebRequestMethods.Ftp.ListDirectory;
        FtpWebResponse response = (FtpWebResponse) ftpRequest.GetResponse();
        StreamReader streamReader = new StreamReader(response.GetResponseStream());
        string line = streamReader.ReadLine();
        while (!string.IsNullOrEmpty(line)) {
            directories.Add(line);
            line = streamReader.ReadLine();
        }
    } catch (WebException e) {
        String status = ((FtpWebResponse) e.Response).StatusDescription;
        System.Windows.Forms.MessageBox.Show(status.ToString());
    }
    return directories.ToArray();
}
// In this part i create the sub-directories.
public void createdir(string path) {
    if (!Directory.Exists(path)) {
        Directory.CreateDirectory(path);
    }
}