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copied!<p>You can inherit custom attribute from <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.requiredattribute.aspx" rel="noreferrer">RequiredAttribute</a> and set your own localized message for property <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.validationattribute.errormessage.aspx" rel="noreferrer">ErrorMessage</a>. It can looks like this:</p> <pre><code>public class LocalizedRequiredAttribute : RequiredAttribute { public LocalizedRequiredAttribute() : base() { // prefix for the selection of localized messages from datebase // e.x. for "Required" string, localized messages will be: "RuRequired", "EnRequired" var currentCulture = CultureInfo.CurrentCulture.TwoLetterISOLanguageName; // logic to get value from datebase // e.x. using Linq2Sql using (var context = new dateBaseContext()) { var query = (from x in context.LocalizedStrings where x.NameKey == currentCulture + "Required" select x.NameValue).SingleOrDefault(); if (query != null) { base.ErrorMessage = query; } else { base.ErrorMessage = "UndefinedName"; } } } } </code></pre> <p>also and you inherit from <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.displaynameattribute.aspx" rel="noreferrer">DisplayNameAttribute</a> and override <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.displaynameattribute.displayname.aspx" rel="noreferrer">DisplayName</a> property:</p> <pre><code>public class LocalizedDisplayNameAttribute : DisplayNameAttribute { public LocalizedDisplayNameAttribute(string displayNameKey) : base(displayNameKey) { } public override string DisplayName { get { if (!string.IsNullOrEmpty(base.DisplayName)) { // prefix for the selection of localized messages from datebase // e.x. if DisplayName is "Country", localized messages will be: "RuCountry", "EnCountry" var currentCulture = CultureInfo.CurrentCulture.TwoLetterISOLanguageName; // logic to get value from datebase // e.x. using Linq2Sql using (var context = new dateBaseContext()) { var query = (from x in context.DisplayNames where x.DisplayNameKey == currentCulture + base.DisplayName select x.DisplayNameValue).SingleOrDefault(); if (query != null) { return query; } return base.DisplayName; } } return "UndefinedName"; } } } </code></pre> <p>also you can create your custom validation attributes that inherits from <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.validationattribute.aspx" rel="noreferrer">ValidationAttribute</a> class.</p>

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