private void Initialize()
        {
            const string userTable = "CREATE TABLE users(" +
                                     "user_id INTEGER PRIMARY KEY AUTOINCREMENT," +
                                     "username VARCHAR(100) UNIQUE NOT NULL," +
                                     "password VARCHAR(20) NOT NULL," +
                                     "key VARCHAR(200)," +
                                     "uid VARCHAR(100)" +
                                     ")";

            const string folderTable = "CREATE TABLE folders(" +
                                       "folder_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                                       "FolderName VARCHAR(50) NOT NULL, " +
                                       "user_id INT NOT NULL," +
                                       "timestamp DATETIME DEFAULT CURRENT_TIMESTAMP," +
                                       "FOREIGN KEY(user_id) REFERENCES users(user_id)" +
                                       ")";

            const string fileTable = "CREATE TABLE files(" +
                                     "file_id INTEGER PRIMARY KEY AUTOINCREMENT," +
                                     "FileName VARCHAR(100) NOT NULL," +
                                     "Path VARCHAR(500) NOT NULL," +
                                     "folder_id INT NOT NULL," +
                                     "extension VARCHAR(10) NOT NULL," +
                                     "timestamp DATETIME DEFAULT CURRENT_TIMESTAMP," +
                                     "FOREIGN KEY(folder_id) REFERENCES folders(folder_id))";

            //CREATE TABLES
            m_manager.ExecuteNonQuery(userTable);
            m_manager.ExecuteNonQuery(folderTable);
            m_manager.ExecuteNonQuery(fileTable);

            //ADD DEFAULT USER TO THE SYSTEM
            User user = new User("EnvelopeUser", "admin@123");

            InsertUser(user);
            user = GetUser();

            //ADD ROOT FOLDER ENTRY IN DB.folders
            Folder folder = new Folder("root", user);

            InsertFolder(folder);
        }