title: MVC - How to put random images from a folder on the master page
body: <p>I have an MVC app and I want on the top of the master page to 
  have a series of random images from the folder.</p>
  
  <p>To do this I have to write code but not where to write the code??
  It has to be done in one place.</p>
  
  <p>I will probably just set the images at the beginning of the session
  so they are cached by the browser and improve performance of the site.</p>
  
  <p>Malcolm</p>