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    <p>I am going to describe it in ASP.NET MVC, but the same can be achieved if you either write an ASP.NET web service or just put a few page methods in your code behind to do the same - you'll also need a JSON serializer, either a 3rd party solution or the one in WCF.</p> <p>Using MVC, first, let's have three controller actions - one to display the page, countries will be static, and two to get the states and metros respectively:</p> <pre><code>public ActionResult Index() { ViewData["Countries"] = _countryRepository.GetList(); return View(); } public ActionResult States(string countryCode) { var states = _stateRepository.GetList(countryCode); return Json(states); } public ActionResult Metros(string countryCode, string state) { var metros = _metroRepository.GetList(countryCode, state); return Json(metros); } </code></pre> <p>In the view, you have three DropDownLists, one is bound to the ViewData["Countries"] object, say it's named Countries, you can get the states in jQuery with an Ajax call like this:</p> <pre><code>$('#Countries').change(function() { var val = $(this).val(); $states = $('#States'); $.ajax({ url: '&lt;%= Url.Action('States') %&gt;', dataType: 'json', data: { countryCode: val }, success: function(states) { $.each(states, function(i, state) { $states.append('&lt;option value="' + state.Abbr+ '"&gt;' + state.Name + '&lt;/option&gt;'); }); }, error: function() { alert('Failed to retrieve states.'); } }); }); </code></pre> <p>The Metros drop down would be filled analogically, passing both the country and state selection to the server and getting back a JSON object with an array of metro areas.</p> <p>I left out the details of repository implementation, just fill up the result variable on the server with a collection of states/metro areas in some way. I also made an assumption that the State class would have two properties - Abbr (e.g., 'CA') and Name (e.g., California).</p> <p>I hope that it helps you in any way, or at least directs you somehow towards the solution.</p>
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    1. COthanks very much, works for me too! did have to put a < in front of the option value....
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    2. COOh, I didn't notice it! Thanks, I have edited my answer.
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    3. COOne note, if not parsing into `json` and returning something like `List<T>`, I had to use `states.d` or else the properties were always undefined.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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