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    <p><em>[UPDATED on 5/24/2012 to make the idea more clear]</em></p> <p>I'm not sure this is the right approach but I think you can extend the concept and can create a more generic / reusable approach.</p> <p>In ASP.NET MVC the validation happens at the binding stage. When you are posting a form to the server the <code>DefaultModelBinder</code> is the one that creates model instances from the request information and add the validation errors to the <code>ModelStateDictionary</code>. </p> <p>In your case, as long as the binding happens with the <code>HomePhone</code> the validations will fire up and <em>I think</em> we can't do much about this by creating <em>custom validation attributes or similar kind</em>. </p> <p>All I'm thinking is not to create model instance at all for <code>HomePhone</code> property when there are no values available in the form <strong>(the areacode, countrycode and number or empty)</strong>, when we control the binding we control the validation, for that, we have to create a <em>custom model binder</em>. </p> <p>In the <em>custom model binder</em> we are checking if the property is <code>HomePhone</code> and if the form contains any values for it's properties and if not we don't bind the property and the validations won't happen for <code>HomePhone</code>. Simply, the value of <code>HomePhone</code> will be null in the <code>UserViewModel</code>.</p> <pre><code> public class CustomModelBinder : DefaultModelBinder { protected override void BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor) { if (propertyDescriptor.Name == "HomePhone") { var form = controllerContext.HttpContext.Request.Form; var countryCode = form["HomePhone.CountryCode"]; var areaCode = form["HomePhone.AreaCode"]; var number = form["HomePhone.Number"]; if (string.IsNullOrEmpty(countryCode) &amp;&amp; string.IsNullOrEmpty(areaCode) &amp;&amp; string.IsNullOrEmpty(number)) return; } base.BindProperty(controllerContext, bindingContext, propertyDescriptor); } } </code></pre> <p>Finally you have to register the custom model binder in global.asax.cs.</p> <pre><code> ModelBinders.Binders.Add(typeof(UserViewModel), new CustomModelBinder()); </code></pre> <p>So now of you have an action that takes UserViewModel as parameter,</p> <pre><code> [HttpPost] public Action Post(UserViewModel userViewModel) { } </code></pre> <p>Our custom model binder come into play and of form doesn't post any values for the <strong>areacode, countrycode and number</strong> for <code>HomePhone</code>, there won't be any validation errors and the <code>userViewModel.HomePhone</code> is null. If the form posts atleast any one of the value for those properties then the validation will happen for <code>HomePhone</code> as expected.</p>
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    1. COI've just left home. What does this exactly do? I'll try it tomorrow.
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    2. COReally nice!!! thanks!
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