API in C# -- login not working

RouterOS Scripting
1

hi …
am asp.net developer
i use this class for api
http://wiki.mikrotik.com/wiki/API_in_C_Sharp

the login page always return : !trap: cannot login

    
public bool Login(string username, string password)
    {
        Send("/login", true);
        string hash = Read()[0].Split(new string[] { "ret=" }, StringSplitOptions.None)[1];
        Send("/login");
        Send("=name=" + username);
        Send("=response=00" + EncodePassword(password, hash), true);
        if (Read()[0] == "!done")
        {
            return true;
        }
        else
        {
            return false;
        }
    }

am sure the username and the password is correct

plz Help …