title: Installing patch for Asp.net web application setup
body: <p>I am using visual studio web project to install my web application and do some customization like modifying connection string in web.config file during install time.</p>
  
  <p>Now, My requirement is to create a patch for the web application so that next time the web installer  only the changed files.</p>
  
  <p>Is there is any one to do it using visualk studio 2010 ide or any other way.We can't  use third party products like Installshield,wix,innosetup etc.</p>
  
  <p>Please suggest.</p>