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rajesh vrajesh v 

diff btwn render,reRender,renderAS

render - Boolean value (if it is true, it displays the block else it will be hidden)

reRender - ID. Particular block will be refreshed.

renderAs - Display the page as pdf, excel, etc...
Hi, what is your question ? 
Amit Chaudhary 8Amit Chaudhary 8

1. Rendered : It use to place condition for a component(Field, outptpanel, section etc), that will show or not on page.

<apex:inputField value="{obj.Filed_C}"  Rendered="{!val == true}"/>

2. ReRender : It is use after a ajax call, Is comonent will again check condition for that component.

3. RederAs : It is use for  Visualforce page show  as PDF file or other

<apex:page controller="mmm" rederAs="pdf">