objXmpp.Server = jid.Server;
    objXmpp.Username = jid.User;
    objXmpp.Password = "password"; //your password of account.
    objXmpp.AutoResolveConnectServer = true;
    try
    {

        objXmpp.OnLogin += loggedIn; // loggedIn is handler for successful login to server.
        objXmpp.OnAuthError += loginFailed;

        objXmpp.Open(objXmpp.Username,objXmpp.Password);
    }
    catch (Exception ex)
    {

    }

void loggedIn(object o)
{

    objXmpp.RegisterAccount = true;
    objXmpp.Send(new agsXMPP.protocol.iq.register.Register("tarun@himanshu-pc", "Pass@123"));
    //Logged in and Active
}