How to render Visualforce page to PDF then Download it.

7. How to render Visualforce page to PDF then Download it.
1. You need to have two page first page is main page

 
     <apex:page id="MainPage" showHeader="false" cache="true" contentType="application/x-pdf#PDF_Name.pdf"
       <apex:include pageName="SecondpageName"/>
     </apex:page>

2. your second page

 <apex:page renderAs="pdf" >//your code</apex:page>