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    <p>You can use DataAnnotations to override the default error messages in MVC, as well as provide your own validation for whatever fields you need to. See the following:</p> <p><a href="http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx" rel="nofollow noreferrer">http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx</a></p> <p><a href="http://www.asp.net/mvc/tutorials/validation-with-the-data-annotation-validators-cs" rel="nofollow noreferrer">http://www.asp.net/mvc/tutorials/validation-with-the-data-annotation-validators-cs</a></p> <p>If you are using EF, you will need to create a MetaData class off the EF generated class and then add the data annotations. The end of the 2nd article covers how to write these classes for entity framework.</p> <p>In your specific case you will want to do something like:</p> <pre><code>using System.ComponentModel.DataAnnotations; public class Person { public string FirstName {get;set;} [Range(0, 110, ErrorMessage = "&lt;your error message&gt;")] public int Age {get;set;} } </code></pre> <p><strong>UPDATE</strong> I did forget one thing that is easy to overlook, you need to include the following JS files for the data annotations to be picked up client side without having to do a post:</p> <ul> <li><p>MicrosoftAjax.js</p></li> <li><p>MicrosfotMvcValidation.js</p></li> </ul> <p>These should be stock in the Scripts folder of your project (if you are using MVC 2), and you need to include them either on your page or in your master page, </p> <pre><code>&lt;script src="&lt;%= Url.Content("~/Scripts/MicrosoftAjax.js") %&gt;" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="&lt;%= Url.Content("~/Scripts/MicrosoftMvcValidation.js") %&gt;" type="text/javascript"&gt;&lt;/script&gt; </code></pre> <p>you will also need to include </p> <p><code>&lt;% Html.EnableClientValidation(); %&gt;</code> </p> <p>on the page in question.</p> <p>The client side validation will not let you submit the form until all fields meet validation requirements, as Kaspars Ozols points out you will still need to call Model.IsValid on your controller.</p>
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    1. POoverride error message (The value 'xxx' is not valid for Age) when input incorrect data type for input field asp.net mvc
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    1. USScott Lance
    1. USScott Lance
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    1. POoverride error message (The value 'xxx' is not valid for Age) when input incorrect data type for input field asp.net mvc
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    1. COThank you very much for your help. Scott Lance. However, it quite doesn't solve my problem since error occurs in type converter I think.
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    2. COIs your view strongly typed? If the view is strongly typed, then the validation enforces that a value of type int is entered, otherwise you will receive the error message.
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    3. COYes, it is strongly type view model. I just want to override the error message when binder cannot covert value to int. For example, I fill value 'test' for Age text box. After posting form, there should be error message "Please input number only." not The The value 'test' is not valid for Age.
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