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    copied!<p>Writing new post because I need more formatting than comments provide.</p> <p>Look at <strong>ValidationAttribute</strong> - base class of validation attributes.</p> <p>If validation error occured, error message will be created by method:</p> <pre><code>public virtual string FormatErrorMessage(string name) { return string.Format(CultureInfo.CurrentCulture, this.ErrorMessageString, new object[] { name }); } </code></pre> <p>Next look at <strong>ErrorMessageString</strong> property:</p> <pre><code>protected string ErrorMessageString { get { if (this._resourceModeAccessorIncomplete) { throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, DataAnnotationsResources.ValidationAttribute_NeedBothResourceTypeAndResourceName, new object[0])); } return this.ResourceAccessor(); } } </code></pre> <p>Property <strong>ResourceAccessor</strong> can be setted from:</p> <pre><code>ValidationAttribute..ctor(Func&lt;String&gt;) ValidationAttribute.set_ErrorMessage(String) : Void ValidationAttribute.SetResourceAccessorByPropertyLookup() : Void </code></pre> <p>First of it is exactly used by dervided classes to format messages, second - the case when we set error message trough <strong>ErrorMessage</strong> property, and third - when resource strings used. Depending on your situation, you may use <strong>ErrorMessageResourceName</strong>.</p> <p>Elsewhere let's look at derived constructors, for our example, Range Attribute:</p> <pre><code>private RangeAttribute() : base((Func&lt;string&gt;) (() =&gt; DataAnnotationsResources.RangeAttribute_ValidationError)) { } </code></pre> <p>Here <strong>RangeAttribute_ValidationError</strong> is loaded from resource:</p> <pre><code>internal static string RangeAttribute_ValidationError { get { return ResourceManager.GetString("RangeAttribute_ValidationError", resourceCulture); } } </code></pre> <p>So you can create resource file for different tan default culture and overwrite messages there, like this:</p> <p><a href="http://www.codeproject.com/KB/aspnet/SatelliteAssemblies.aspx" rel="nofollow noreferrer">http://www.codeproject.com/KB/aspnet/SatelliteAssemblies.aspx</a></p> <p><a href="http://msdn.microsoft.com/en-us/library/aa645513(VS.71).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/aa645513(VS.71).aspx</a></p>
 

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