private void btnGo_Click(object sender, EventArgs e)
        {
            lbDirectory.Items.Clear();

            string address = "";
            string user = "";
            string pass = "";

            if (!String.IsNullOrEmpty(tbAddress.Text))
            {
                address = tbAddress.Text;
            }

            if (!String.IsNullOrEmpty(tbUser.Text))
            {
                user = tbUser.Text;
            }

            if (!String.IsNullOrEmpty(tbPassword.Text))
            {
                pass = tbPassword.Text;
            }

            if (!String.IsNullOrEmpty(address) && !String.IsNullOrEmpty(user) && !String.IsNullOrEmpty(pass))
            {
                try
                {
                    ftp = new FtpClient(address, user, pass);
                    lbDirectory.Items.AddRange(ftp.ListDir());
                }
                catch (Exception ex)
                {
                    lbDirectory.Items.Add("An error occured:");
                    lbDirectory.Items.Add(ex.Message);
                }
            }
            else
            {
                lbDirectory.Items.Add("All fields (address/user/pass) must be filled");
            }
        }