title: aspx.designer.cs how does it work?
body: <p>I'm a really beginner so my question may be appear ridiculous.. But, i wonder how the files <em>.aspx.designer.cs</em> works..
  It's the first time i work with a solution containing files <em>.aspx.designer.cs</em> for each pages. So i understand it's declaration of controls used in the .aspx for code-behind..</p>
  
  <p>Here is my questions:</p>
  
  <p>Why sometimes solutions doen't have .aspx.designer.cs files? (is the files hidden or doesn't exists?)</p>
  
  <p>I often have problems with this files, they don't Automatically recreate declarations of controls when i add some in the .aspx code, what am i doing wrong?</p>