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    <p>As smnbss comments in Darin Dimitrov's answer, <code>Prompt</code> exists for exactly this purpose, so there is <strong>no need to create a custom attribute</strong>. From the the documentation:</p> <blockquote> <p>Gets or sets a value that will be used to set the watermark for prompts in the UI.</p> </blockquote> <p>To use it, just decorate your view model's property like so:</p> <pre><code>[Display(Prompt = "numbers only")] public int Age { get; set; } </code></pre> <p>This text is then conveniently placed in <code>ModelMetadata.Watermark</code>. Out of the box, the default template in MVC 3 ignores the <code>Watermark</code> property, but making it work is really simple. All you need to do is tweaking the default string template, to tell MVC how to render it. Just edit String.cshtml, like Darin does, except that rather than getting the watermark from <code>ModelMetadata.AdditionalValues</code>, you get it straight from <code>ModelMetadata.Watermark</code>:</p> <p>~/Views/Shared/EditorTemplates/String.cshtml:</p> <pre><code>@Html.TextBox("", ViewData.TemplateInfo.FormattedModelValue, new { @class = "text-box single-line", placeholder = ViewData.ModelMetadata.Watermark }) </code></pre> <p>And that is it.</p> <p>As you can see, the key to make everything work is the <code>placeholder = ViewData.ModelMetadata.Watermark</code> bit.</p> <p>If you also want to enable watermarking for multi-line textboxes (textareas), you do the same for MultilineText.cshtml:</p> <p>~/Views/Shared/EditorTemplates/MultilineText.cshtml:</p> <pre><code>@Html.TextArea("", ViewData.TemplateInfo.FormattedModelValue.ToString(), 0, 0, new { @class = "text-box multi-line", placeholder = ViewData.ModelMetadata.Watermark }) </code></pre>
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    1. COI'd love to +1 this answer, but it just doesn't seem to pan out for me. Wonder if there's a difference in using EditorFor() vs Html.TextBox() ?
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    2. CO@Brett There is, indeed. EditorFor() is a **templated** helper introduced in MVC 2. At first glance it might seem to do the same thing as TextBox(), but it gives you the big advantage of allowing you to control exactly how you want your HTML generated. My answer is based on this feature to "teach" MVC what to do with the `Prompt` attribute. For more information on these templates, you can refer to this great post by Brad Wilson: http://bradwilson.typepad.com/blog/2009/10/aspnet-mvc-2-templates-part-1-introduction.html
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    3. COThis cannot be localized. The above version can!
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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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