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copied!<blockquote> <p>But i am not able to compile my code. I am getting an error like An attribute argument must be a constant expression,typeof expression or array creation expression of an attribute parameter type</p> </blockquote> <p>Because you cannot Customize the Properties like <code>ErrorMessageResourceName</code> and <code>ErrorMessageResourceType</code> to fetch some Dynamic results.</p> <p>You can only Customize the <code>Length</code> Property in <code>StringLengthAttribute</code> class by passing the Parameterized Constructor in your Customized class. That means you can only <code>Override</code> the <code>Length</code> of <code>String</code></p> <p>Like you said you want to pass some key to get the corresponding <code>Error Message</code>, that is not possible.</p> <p>You can also write the below mentioned Message in you Resource file</p> <pre><code>"Maximum allowed length is {0}" </code></pre> <p>and at run time you can Format the String by Replacing it with Parametrized Constructor value(which is Max String Length) in your Custom Class</p> <blockquote> <p>Get User's language preference from Session and return the labelText here</p> </blockquote> <p>You have set the language in you Global.asax file. So, your resource file will be picked according to the <code>UserLanguage</code>. So, just specify the Key name and corresponding value will be fetched from <code>Resource file</code> according to the selected language</p> <p><strong>How can I set the language?</strong></p> <pre><code>public sealed class LanguageManager { /// <summary> /// Default CultureInfo /// </summary> public static readonly CultureInfo DefaultCulture = new CultureInfo("en-US"); /// <summary> /// Available CultureInfo that according resources can be found /// </summary> public static readonly CultureInfo[] AvailableCultures; static LanguageManager() { List<string> availableResources = new List<string>(); string resourcespath = Path.Combine(System.Web.HttpRuntime.AppDomainAppPath, "App_GlobalResources"); DirectoryInfo dirInfo = new DirectoryInfo(resourcespath); foreach (FileInfo fi in dirInfo.GetFiles("*.*.resx", SearchOption.AllDirectories)) { //Take the cultureName from resx filename, will be smt like en-US string cultureName = Path.GetFileNameWithoutExtension(fi.Name); //get rid of .resx if (cultureName.LastIndexOf(".") == cultureName.Length - 1) continue; //doesnt accept format FileName..resx cultureName = cultureName.Substring(cultureName.LastIndexOf(".") + 1); availableResources.Add(cultureName); } List<CultureInfo> result = new List<CultureInfo>(); foreach (CultureInfo culture in CultureInfo.GetCultures(CultureTypes.SpecificCultures)) { //If language file can be found if (availableResources.Contains(culture.ToString())) { result.Add(culture); } } AvailableCultures = result.ToArray(); CurrentCulture = DefaultCulture; if (!result.Contains(DefaultCulture) && result.Count > 0) { CurrentCulture = result[0]; } } /// <summary> /// Current selected culture /// </summary> public static CultureInfo CurrentCulture { get { return Thread.CurrentThread.CurrentCulture; } set { Thread.CurrentThread.CurrentUICulture = value; Thread.CurrentThread.CurrentCulture = value; } } } </code></pre>

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