I have a very simple custom resource provider implementation , which looks like this:

Public Class XXCustomResourceProviderFactory
    Inherits ResourceProviderFactory
    Public Overrides Function CreateGlobalResourceProvider
        Return New XXCustomResourceProvider(Nothing, classKey)
    End function

CreateLocalResourceProvider returns nothing, as does the ResourceReader property of XXCustomResourceProvider .

XXCustomResourceProvider.Getobject() always returns the string "hello world".

I have registered the XXCustomResourceProviderFactory.dll in the GAC using gacutil, but website which uses this dll does not build ( says its cant find type XXCustomResourceProviderFactory in the assembly ).  My config file does have

<globalization resourceProviderFactoryType="XXCustomResourceProviders" ........

Also, on the control in my aspx page, I use attribute like
Text="<%$ Resources:XYZ, MorningGreeting %>"

.  Is this correct?

it seems the type I was using was wrong, it should have been namespace.classname in this line

<globalization resourceProviderFactoryType = ........