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copied!<p>The following line of code is wrong:</p> <pre><code>new SelectList(cities.AsEnumerable(), "CityID", "Name") </code></pre> <p>You are specifying <code>CityID</code> and <code>Name</code> properties but <code>cities</code> is an <code>IEnumerable<SelectListItem></code>. And <code>SelectListItem</code> only has <code>Value</code> and <code>Text</code> properties. There's no such thing as <code>CityID</code> and <code>Name</code>.</p> <p>So you probably meant:</p> <pre><code>ViewData["AllCities"] = cities != null ? new SelectList(cities, "Value", "Text") : new SelectList(DefaultCities, "Name"); </code></pre> <p>or simply:</p> <pre><code>ViewData["AllCities"] = cities != null ? cities : new SelectList(DefaultCities, "Name"); </code></pre> <p>and in your view:</p> <pre><code>@Html.DropDownList( "CityID", ViewData["AllCities"] as IEnumerable<SelectListItem>, "--Choose One--" ) </code></pre> <p>As far as the <code>CityID</code> argument in your view is concerned, this will basically be used by the DropDownList helper to generate the <code>name</code> property of the select element in your DOM and as a consequence that will be the selected value name being passed to the controller action that you are submitting your form to.</p> <p>By the way using ViewData/ViewBag is very bad practice. I would recommend you using a view model instead and have a strongly typed DropDownListFor helper in your view which will be tied to a specific property on your view model.</p>

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