title: cascade set null entity framework
body: <p>I'm having a problem regarding Entity Framework. I've to entities: Projects and Categories.
  A category has multiple projects and a project has just 1 category.</p>
  
  <p>Now, what I want is when I delete a category all projects with that category are set to null (so the category reference). I enabled the cascade in my edmx file, but it's not working at all..</p>
  
  <p>What am I missing out on?</p>