Need help with Custom Membership Provider

Hello,
I am using the Custom Membership Provider from this CodeProject article
http://www.codeproject.com/KB/aspnet/customaspnetproviders.aspx
If you scroll down to the Possible Enhancements section, the author lays forth a method of hashing passwords within his Custom Membership Provider

I have copied the code verbatim, however, after making these changes, "Invalid Password" is always returned by the Login control when I attempt to submit any user credentials.
How can I get this working? Thanks! 
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