Opc.Ua.Configuration.UserNameCreator.LoadUserName C# (CSharp) Method

        public static Dictionary<string, UserNameIdentityToken> LoadUserName(string applicationName)
        {
            Dictionary<string, UserNameIdentityToken> resultTokens = new Dictionary<string, UserNameIdentityToken>();

            try
            {
                string relativePath = Utils.Format("%CommonApplicationData%\\OPC Foundation\\Accounts\\{0}", applicationName);
                string absolutePath = Utils.GetAbsoluteDirectoryPath(relativePath, false, false, false);

                if (string.IsNullOrEmpty(absolutePath))
                {
                    return resultTokens;
                }

                foreach (string filePath in Directory.GetFiles(absolutePath))
                {
                    // oops - nothing found.
                    if (filePath == null)
                    {
                        continue;
                    }

                    // open the file.
                    using (FileStream istrm = File.Open(filePath, FileMode.Open, FileAccess.Read))
                    {
                        using (XmlTextReader reader = new XmlTextReader(istrm))
                        {
                            DataContractSerializer serializer = new DataContractSerializer(typeof(UserNameIdentityToken));
                            UserNameIdentityToken userNameToken = (UserNameIdentityToken)serializer.ReadObject(reader, false);

                            if (userNameToken.UserName == null || userNameToken.Password == null)
                            {  // The configuration file has problem.
                                Utils.Trace("Unexpected error saving user configuration for COM Wrapper.");
                                continue;
                            }

                            if (resultTokens.ContainsKey(userNameToken.UserName))
                            {   // When I already exist, I ignore it.
                                Utils.Trace("When I already exist, I ignore it. UserName={0}", userNameToken.UserName);
                                continue;
                            }

                            userNameToken.Password = DecryptPassword(userNameToken.Password);
                            userNameToken.DecryptedPassword = new UTF8Encoding().GetString(userNameToken.Password);

                            resultTokens.Add(userNameToken.UserName, userNameToken);
                        }
                    }
                }
            }
            catch (Exception e)
            {
                Utils.Trace(e, "Unexpected error saving user configuration for COM Wrapper.");
            }

            return resultTokens;
        }

        /// <summary>
        /// Initialize the ListView.
        /// </summary>
        private void InitializeListViewValue()
        {
            // Clear item.
            UserNameListView.Items.Clear();

            Dictionary <string, UserNameIdentityToken> userNameTokens = UserNameCreator.LoadUserName(m_applicationName);

            foreach (UserNameIdentityToken item in userNameTokens.Values)
            {
                // Add item.
                ListViewItem listItem = new ListViewItem(item.UserName);
                listItem.Tag = item;
                UserNameListView.Items.Add(listItem);
            }
        }