public static void RemoveAccount(Accountofdevice account)
 {
     // Remove the account from the accounts list
     AccountList.Remove(account);
     // Re save the updated list
     SaveAccountListAsync();
 }
        public static Accountofdevice AddAccount(string username)
        {
            // Create a new account with the username
            Accountofdevice account = new Accountofdevice()
            {
                Username = username
            };

            // Add it to the local list of accounts
            AccountList.Add(account);
            // SaveAccountList and return the account
            SaveAccountListAsync();
            return(account);
        }