title: Read app.config file in Installscript
body: <p>I wan to know that how to read connection string from app.config using installshield es, though there is an option to import the app.config file XML structure but the problem is the section of the connection is being updated at runtime.</p>
  
  <p>During Upgrade i need to fetch the the app.config file's connection string section is there any way to implement this.</p>
  
  <p>Thanks</p>