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copied!<p>I'd recommend not using [Required] for this, as [Required] and subclassed types have the special meaning of being <em>always</em> required - not conditionally required.</p> <p>You can make your own attribute which subclasses ValidationAttribute and carries along client-side validation info. There are several resources available for how to write custom client-side validation code. For example, see:</p> <ul> <li><a href="http://blogs.msdn.com/b/stuartleeks/archive/2010/07/27/asp-net-mvc-adding-client-side-validation-to-validatepasswordlengthattribute.aspx" rel="nofollow">http://blogs.msdn.com/b/stuartleeks/archive/2010/07/27/asp-net-mvc-adding-client-side-validation-to-validatepasswordlengthattribute.aspx</a></li> <li><a href="http://devermind.com/aspnet-mvc/asp-net-mvc-tip-3-how-to-cover-all-your-client-side-form-validation-needs-without-writing-any-javascript-part1/" rel="nofollow">http://devermind.com/aspnet-mvc/asp-net-mvc-tip-3-how-to-cover-all-your-client-side-form-validation-needs-without-writing-any-javascript-part1/</a></li> </ul> <p>In MVC 3, you can use IClientValidatable for this, which makes life a little simpler. See <a href="http://blogs.msdn.com/b/stuartleeks/archive/2010/07/28/asp-net-mvc-adding-client-side-validation-to-validatepasswordlengthattribute-in-asp-net-mvc-3-preview-1.aspx" rel="nofollow">http://blogs.msdn.com/b/stuartleeks/archive/2010/07/28/asp-net-mvc-adding-client-side-validation-to-validatepasswordlengthattribute-in-asp-net-mvc-3-preview-1.aspx</a> for an example.</p>

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