>The where function just takes your entity as a parameter and you return a boolean result. If you want no results you just return false:

operators = operators.Where(o => false));

>As for changing the type of the id, can't you just change the controller to accept string in place of int?

This doesn't seem to work for me.

Here is the code I have in my js file:

var url = '/Operator/Edit/' + id;

   $.get(url, function (html) {
      $($dlg).html(html);
   });

   RunModalDialog("Edit Operator: " + fullName);

So, the url variable is correct '/Operator/Edit/ADMIN ' (space at the end - could it be a problem)?

However, I get code NULL in this code

// GET: /Operator/Edit/Admin
      [HttpGet]
      public ActionResult Edit(String code)
      {
         var oOperator = Db.GetOperatorByCode(code);
         OperatorViewModel model = new OperatorViewModel(oOperator);

         return PartialView("_OperatorForm", model);
      }

UPDATE. Never mind, I should have named the parameter id here, not code.

It works now.