Session state

[JMMB]

The following code works fine when testing with the help web page, but it
doesn't work when running from the client application. Anybody knows what
could be the problem here? thanks a lot.
JMMB

[WebMethod(EnableSession=true)]
public string CreateSession()
{
Session["nome"] = "Marcelo";
return Session["nome"].ToString();
}

[WebMethod(EnableSession=true)]
public string ReadSession()
{
if(Session["nome"] != null)
return Session["nome"].ToString();
else
return "expired";
}

[WebMethod(EnableSession=true)]
public void AbandonSession()
{
Session.Abandon();
}