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Trying to override SoapHeaderAttribute to add Authentication to the attribute
public WebserviceAuthentication currentUser;

    [WebMethod(Description="Returns the logged in users credentials")]
    [SoapHeader("currentUser")]
    public string HelloWorld()
    {
        var user = AuthenticateUser(currentUser, WebServiceResources.MEDICAREELIGIBILITY_HELLOWORLD);
        return string.Format("{0} {1} {2}", user.User.UserName, user.User.ProviderUserKey, user.AccountId);
    }

public WebserviceAuthentication currentUser;
    public CustomAuthentication user;

    [WebMethod(Description="Returns the logged in users credentials")]
    [SoapHeaderAuthentication("currentUser")]
    public string HelloWorld()
    {
        return string.Format("{0} {1} {2}", user.User.UserName, user.User.ProviderUserKey, user.AccountId);
    }