title: What's the point of id in routing of ASP MVC
body: <p>First of all, I still learning ASP MVC.</p>
  
  <p>we all know the default setup in url is <code>controller/action/id</code></p>
  
  <p>Yet when submitting a form, model is what we pass into controllers, which contain all the data we want, so what's the point of passing id in the url? in which case do we need id?</p>
  
  <p>Until now the only way id can be used is get the model from EF.</p>