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    <p>Data annotations can be used to validate models on both the client <em>and</em> the server. </p> <p>On the server-side the <code>DefaultModelBinder</code> will automatically validate the models that are POSTed to your action methods but it won't prevent invalid models from being POSTed. It will simply add the error to the <code>ModelState</code> and set the <code>ModelState.IsValid</code> property to <code>false</code> (as you have discovered). That means you need to check the <code>ModelState.IsValid</code> property and redisplay the form with the model if it isn't valid:</p> <pre><code>[HttpPost] public ActionResult Edit(MyViewModel model, string button) { if (!ModelState.IsValid) { // The model isn't valid. // Redisplay the form with the invalid model. return View(model); } // If we got here it means the model is valid. } </code></pre> <p>Redisplaying the form with the invalid model will allow any <code>@Html.ValidationSummary()</code> or <code>@Html.ValidationMessageFor(m =&gt; m.UserName)</code> helper methods to render their validation error messages to the page.</p> <blockquote> <p>As far as I know, my action should not be called if the model validation fails.</p> </blockquote> <p>This is only true if client-side validation is enabled. You can do this by adding the following <em>appSettings</em> to your Web.config file:</p> <pre><code>&lt;appSettings&gt; &lt;add key="ClientValidationEnabled" value="true" /&gt; &lt;add key="UnobtrusiveJavaScriptEnabled" value="true" /&gt; &lt;/appSettings&gt; </code></pre> <p>... and adding references to the <em>jquery.validate.js</em> and <em>jquery.validate.unobtrusive.js</em> scripts to your view. This will allow JavaScript to validate the model <em>before</em> it is sent to the server and the validation messages will show without a page refresh (much better for the user and your server!). As @John H pointed out in the question comments, client-side validation is no substitute for server-side validation. So be sure to leave your server-side validation checks in place.</p>
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    1. POWhy is my model not being validated agains data annotations when calling my controller action?
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    1. COThanks to you and @John H, I've learned a lot with you two guys. I am still missing something to prevent the postback to my action, I will spend some more time re-reading you answer and researching about it. If I fail, I might come back to this question :)
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    2. COFYI, I wasn't referencing Jquery. Now it works perfectly. Thanks guys :D
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