title: MVC DropDownList Select Populates ListBox (Both Selects)
body: <p>I have an MVC view that has a model with a <code>IEnumerable&lt;SelectListItem&gt;</code> which populates a <code>@Html.DropDownList</code> (Form select).
  I want to write code so that when a item in the drop down list is selected, it will populate another listbox (also a form select) with values from the server.</p>
  
  <p>Should I use AJAX to get a seperate partial view that contains the listbox with the values on each click of the dropdownlist?  Or should I generate a listbox on load and then use WebAPI to just get the data on each click?</p>
  
  <p>It seems like a simple problem but I'm trying to figure out my models and views and the best approach.</p>