asp.net mvc - MVC: Override default ValidationMessage

Question

In the world of MVC I have this view model...

public class MyViewModel{

[Required]
public string FirstName{ get; set; }    }

...and this sort of thing in my view...

<%= Html.ValidationSummary("Please correct the errors and try again.") %>
<%= Html.TextBox("FirstName") %>
<%= Html.ValidationMessage("FirstName", "*") %>

My question: If I submit this form without supplying a name, I get the following message "The FirstName field is required"

OK. So, I go and change my property to...

[DisplayName("First Name")]
[Required]
public string FirstName{ get; set; }    

..and now get "The First Name field is required"

All good so far.

So now I want the error message to display "First Name Blah Blah". How can I override the default message to display DisplayName + " Blah Blah", wihtout annotating all the properties with something like

[Required(ErrorMessage = "First Name Blah Blah")]

Cheers,

ETFairfax

Answer 1

public class GenericRequired: RequiredAttribute
{
    public GenericRequired()
    {
        this.ErrorMessage = "{0} Blah blah"; 
    }
}