>Sorry, I should have looked more closely at your code.
>You can't use it in that way. As per the link RequestValidationType Property is simply defined as an attribute of HttpRuntimeSection:
>http://msdn.microsoft.com/en-us/library/system.web.configuration.httpruntimesection.requestvalidationtype.aspx
>You need a class such as this:

Public Class MyRequestValidator
>	Inherits System.Web.Util.RequestValidator
>	Protected Overrides Function IsValidRequestString(context As HttpContext, value As String, requestValidationSource__1 As System.Web.Util.RequestValidationSource, collectionKey As String, ByRef validationFailureIndex As Integer) As Boolean
>		validationFailureIndex = 0
>
>		'Spurious rejection test
>		If requestValidationSource__1 = RequestValidationSource.RawUrl AndAlso value.Contains("Default") Then
>			Return False
>		End If
>
>
>		Return MyBase.IsValidRequestString(context, value, requestValidationSource__1, collectionKey, validationFailureIndex)
>	End Function
>End Class

and then reference that in web.config.....

Thanks, so basically, the class was good but a reference was still needed in Web.Config.