title: The property 'StatusId' is part of the object's key information and cannot be modified
body: <p>I am using entity frame work when I tried to modify  <code>rm.StatusId = 3;</code>
   I get the title question error.
  Also please give me links to know each and everything about entity frame work with asp .net controlls.</p>
  
  <pre><code>if (chk.Checked == true)
  {
     MAtt_RequestMaster rm =
        ctx.MAtt_RequestMaster.SingleOrDefault(p =&gt; p.AutoID ==id);
     rm.StatusId = 3;
     ctx.SaveChanges();
  }
  </code></pre>