know about request scope in JSF(how to pass parameter from one page to other)

[rajesh vaja]

Hi
know about request scope in JSF.
how to pass parameter from one page to other



<t:commandLink id="viewselectsectgfergfionindex" action="#{selectinstrumentindex.populate}" title="xyz">
<t:graphicImage id="id11" align="center" url="/resources/images/Back_Button.gif" border="1" />

<f:param name="surveyCode" value="#{selectsectionindex.ssSurveyCode}"/>
<f:param name="respCode" value="#{selectsectionindex.respCode}"/>

</t:commandLink>



<navigation-rule>
<from-view-id>/modules/mod_surclient/selectsectionindex.jsp</from-view-id>
<navigation-case>
<from-outcome>sectiontoselectsuccess</from-outcome>
<to-view-id>/modules/mod_surclient/surselectoptionindex.jsp</to-view-id>
</navigation-case>
</navigation-rule>


public String populate()
{
try
{
PortletRequest portletRequest1 = (PortletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest();

setParameterSurveyCode(portletRequest1.getParameter("surveyCode"));
}
catch(Exception e)
{
logger.error(e);
return "surselectoptionindexerror";
}
return "surselectoptionindexsuccess";
}


Here in populate() i get the value of the Parameter Survey Code But After i view my
surselectoptionindex.jsp page i am not able to get parameter from the potlet request..
And Also From My bean getter method getParameterSurveyCode()..

Please help me..........