How to add help prompt attributes to Business Objects in MVC and display in View

How can I provide some form of Attribute against my Business Objects in my ASP.Net MVC application so that I can pick up the help texts in the View and have them appear as pop-up hover help texts like this:

<%= Html.TextBox("PostalCode", Model.PostalCode, new { 
    title = "Please enter your postal code." })%>

I want to be able to get the 'title' value from my ViewModel which will have picked up the text from an attribute on the Business Object.

In summary, how can I apply help text attributes / metadata on my Business Objects?

Here is how I did it:

1. Created new Attribute as follows:

   public class HelpPromptAttribute : Attribute
   {
     public HelpPromptAttribute(string text)
     {
         myproperty = text; 
     }
     protected string myproperty;
   
     public string HelpTextKey
     {
         get { return myproperty; }
         set { myproperty = value; }
     }
   }
   

2. Added attribute to entity property as follows:

   [HelpPrompt("ProjectDescription")]
   [Required(ErrorMessageResourceName = "ProjectDescriptionRequired", ErrorMessageResourceType = typeof(EntityValidationMessages))]
   [StringLength(50, ErrorMessageResourceName = "ProjectDescriptionTooLong", ErrorMessageResourceType = typeof(EntityValidationMessages))]
   public string ProjectDescription { get; set; }
   

3. Added Extension Method to Entities as follows:

   public static class EntityBOExtensions
   {
     public static string PropertyHelp(this object objectBO, string PropertyName)
     {
         Type type = objectBO.GetType();
   
   
         foreach (PropertyInfo pInfo in type.GetProperties())
         {
             if (string.Compare(pInfo.Name, PropertyName) == 0)
             {
                 foreach (Attribute attr in Attribute.GetCustomAttributes(pInfo))
                 {
                     if (attr.GetType() == typeof(HelpPromptAttribute))
                     {
                         string key = ((HelpPromptAttribute)attr).HelpTextKey;
                         if (!string.IsNullOrEmpty(key))
                             return EntityBOHelp.ResourceManager.GetString(key);
                     }
                 }
             }
         }
         return null;
     }
   }
   

4. Added a HtmlHelper (simple) as follows:

   public static string LocalisedTextBoxWithHelp(this HtmlHelper helper, string name, object value, string helptext)
   {
       string textbox = helper.TextBox(name, value, new { helpprompt = helptext });
       return textbox;
   }
   

5. And finally used the folowing markup in the View:

    <%= Html.LocalisedTextBoxWithHelp("project.ProjectDescription", Model.ProjectDescription, Model.PropertyHelp("ProjectDescription"))%>
   

This does the job although it needs refinement. ;)