winform中用setting保存用户名和密码

 Settings.Default.IsSave = cbSavePw.Checked;
                if (cbSavePw.Checked)
                {
                    Settings.Default.UserName = tbUserName.Text.Trim();
                    Settings.Default.Password = tbPassword.Text.Trim();
                }
                else
                {
                    Settings.Default.UserName = string.Empty;
                    Settings.Default.Password = string.Empty;
                }
                Settings.Default.Save();