>You can specify the replacement validation in web.config:

<configuration>
>  <system.web>
>    <httpRuntime requestValidationType = "{namespace}.CustomRequestValidation,{assemblyname}"/>
>  </system.web>
></configuration>

Thanks, but if I would like to keep control at the framework level, this seems like the place to put it. Here is the top of the GlobalBase class which inherits from System.Web.HttpApplication.

Imports System.Reflection
Imports System.Web
Imports System.Web.Util

Namespace Framework

    Public Class GlobalBase
        Inherits System.Web.HttpApplication

        Private oApp As Framework.App

<ConfigurationPropertyAttribute("requestValidationType", DefaultValue := "System.Web.Util.RequestValidator")> _
<StringValidatorAttribute(MinLength := )> _
Public Property RequestValidationType As String
            Get
                Return "CustomRequestValidation"
            End Get
        End Property

However, when doing so, the ) in the MinLenght definition is highlighted and the designer gives:

"Expression selected"

I do not know why it is complaining with the default.