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    <p>Just for fun, I created my own custom error (message) handler that works pretty much as TempData, but with the small difference that this handler is accessible all over the application. </p> <p>I'm not going to explain every single step of code, but to sum it all up, I used IHttpModule to fire a method for every request and Session to save data. Below is the code, feel free to edit or give suggestions for improvements.</p> <p><strong>Web.config</strong> (Define module)</p> <pre><code>&lt;httpModules&gt; &lt;add name="ErrorManagerModule" type="ErrorManagerNamespace.ErrorManager"/&gt; &lt;/httpModules&gt; &lt;system.webServer&gt; &lt;modules runAllManagedModulesForAllRequests="true"&gt; &lt;add name="ErrorManagerModule" type="ErrorManagerNamespace.ErrorManager"/&gt; &lt;/modules&gt; &lt;/system.webServer&gt; </code></pre> <p><strong>ErrorManager.cs</strong> (Error manager handler code)</p> <pre><code>public class ErrorManager : IRequiresSessionState, IHttpModule { private const string SessionKey = "ERROR_MANAGER_SESSION_KEY"; public enum Type { None, Warning, Success, Error } /* * * Public methods * */ public void Dispose() { } public void Init(HttpApplication context) { context.AcquireRequestState += new EventHandler(Initiliaze); } public static IList&lt;ErrorModel&gt; GetErrors(ErrorManager.Type type = Type.None) { // Get all errors from session var errors = GetErrorData(); // Destroy Keep alive // Decrease all errors request count foreach (var error in errors.Where(o =&gt; type == ErrorManager.Type.None || o.ErrorType == type).ToList()) { error.KeepAlive = false; error.IsRead = true; } // Save errors to session SaveErrorData(errors); //return errors; return errors.Where(o =&gt; type == ErrorManager.Type.None || o.ErrorType == type).ToList(); } public static void Add(ErrorModel error) { // Get all errors from session var errors = GetErrorData(); var result = errors.Where(o =&gt; o.Key.Equals(error.Key, StringComparison.OrdinalIgnoreCase)).FirstOrDefault(); // Add error to collection error.IsRead = false; // Error with key is already associated // Remove old error from collection if (result != null) errors.Remove(result); // Add new to collection // Save errors to session errors.Add(error); SaveErrorData(errors); } public static void Add(string key, object value, ErrorManager.Type type = Type.None, bool keepAlive = false) { // Create new error Add(new ErrorModel() { IsRead = false, Key = key, Value = value, KeepAlive = keepAlive, ErrorType = type }); } public static void Remove(string key) { // Get all errors from session var errors = GetErrorData(); var result = errors.Where(o =&gt; o.Key.Equals(key, StringComparison.OrdinalIgnoreCase)).FirstOrDefault(); // Error with key is in collection // Remove old error if (result != null) errors.Remove(result); // Save errors to session SaveErrorData(errors); } public static void Clear() { // Clear all errors HttpContext.Current.Session.Remove(SessionKey); } /* * * Private methods * */ private void Initiliaze(object o, EventArgs e) { // Get context var context = ((HttpApplication)o).Context; // If session is ready if (context.Handler is IRequiresSessionState || context.Handler is IReadOnlySessionState) { // Load all errors from session LoadErrorData(); } } private static void LoadErrorData() { // Get all errors from session var errors = GetErrorData().Where(o =&gt; !o.IsRead).ToList(); // If KeepAlive is set to false // Mark error as read foreach (var error in errors) { if (error.KeepAlive == false) error.IsRead = true; } // Save errors to session SaveErrorData(errors); } private static void SaveErrorData(IList&lt;ErrorModel&gt; errors) { // Make sure to remove any old errors HttpContext.Current.Session.Remove(SessionKey); HttpContext.Current.Session.Add(SessionKey, errors); } private static IList&lt;ErrorModel&gt; GetErrorData() { // Get all errors from session return HttpContext.Current.Session[SessionKey] as IList&lt;ErrorModel&gt; ?? new List&lt;ErrorModel&gt;(); } /* * * Model * */ public class ErrorModel { public string Key { get; set; } public object Value { get; set; } public bool KeepAlive { get; set; } internal bool IsRead { get; set; } public Type ErrorType { get; set; } } </code></pre> <p><strong>HtmlHelperExtension.cs</strong> (An extension method for rendering the errors)</p> <pre><code>public static class HtmlHelperExtension { public static string RenderMessages(this HtmlHelper obj, ErrorManager.Type type = ErrorManager.Type.None, object htmlAttributes = null) { var builder = new TagBuilder("ul"); var errors = ErrorManager.GetErrors(type); // If there are no errors // Return empty string if (errors.Count == 0) return string.Empty; // Merge html attributes builder.MergeAttributes(new RouteValueDictionary(htmlAttributes), true); // Loop all errors foreach (var error in errors) { builder.InnerHtml += String.Format("&lt;li class=\"{0}\"&gt;&lt;span&gt;{1}&lt;/span&gt;&lt;/li&gt;", error.ErrorType.ToString().ToLower(), error.Value as string); } return builder.ToString(); } } </code></pre> <p><strong>Usage for creating errors</strong></p> <pre><code>// This will only be available for one request ErrorManager.Add("Key", "An error message", ErrorManager.Type.Error); // This will be available for multiple requests // When error is read, it will be removed ErrorManager.Add("Key", "An error message", ErrorManager.Type.Error, true); // Remove an error ErrorManager.Remove("AnotherKey"); // Clear all error ErrorManager.Clear(); </code></pre> <p><strong>Usage for rendering errors</strong></p> <pre><code>// This will render all errors &lt;%= Html.RenderMessages() %&gt; // This will just render all errors with type "Error" &lt;%= Html.RenderMessages(ErrorManager.Type.Error) %&gt; </code></pre>
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