how to put and get request property

[piyush.hans]

hii all

           
                    <set field="requestParameters.viewSize" value="viewSize"/>
           
                           <if-not-empty  result-map="result">   
       <auto-fields-entity entity-name="ProductCategory" default-field-type="display"/> 
        </if-not-empty>
     


this is my code and i want to apply if-else condition in a form

and want put a field and a list in the request property in the form  and want to get the list and field under screen tag


could any help  me

pls  attach  the code for putting  and getting the data in request property