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copied!<p>As always you start with a model:</p> <pre><code>public class MyViewModel { public int? Year { get; set; } public int? Month { get; set; } public IEnumerable<SelectListItem> Years { get { return Enumerable.Range(2000, 12).Select(x => new SelectListItem { Value = x.ToString(), Text = x.ToString() }); } } } </code></pre> <p>then a controller:</p> <pre><code>public class HomeController : Controller { public ActionResult Index() { var model = new MyViewModel(); return View(model); } public ActionResult Months(int year) { if (year == 2011) { return Json( Enumerable.Range(1, 3).Select(x => new { value = x, text = x }), JsonRequestBehavior.AllowGet ); } return Json( Enumerable.Range(1, 12).Select(x => new { value = x, text = x }), JsonRequestBehavior.AllowGet ); } } </code></pre> <p>and finally a view:</p> <pre><code>@model AppName.Models.MyViewModel @Html.DropDownListFor( x => x.Year, new SelectList(Model.Years, "Value", "Text"), "-- select year --" ) @Html.DropDownListFor( x => x.Month, Enumerable.Empty<SelectListItem>(), "-- select month --" ) <script type="text/javascript"> $('#Year').change(function () { var selectedYear = $(this).val(); if (selectedYear != null && selectedYear != '') { $.getJSON('@Url.Action("Months")', { year: selectedYear }, function (months) { var monthsSelect = $('#Month'); monthsSelect.empty(); $.each(months, function (index, month) { monthsSelect.append($('<option/>', { value: month.value, text: month.text })); }); }); } }); </script> </code></pre> <p>Obviously you will notice that in my example I have hardcoded all the values. You should improve this logic by using notions like current year, current month, probably even fetch those values from a repository, etc... but for the purpose of the demonstration this should be enough to put you on the right track.</p>

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