SQL Server Express Triggers to Compare hashed passwords before updating user passwords

I recently asked a question where i need to develop a way to compare the last 5 passwords for a user before they update their password in a SQL database prior to the password being changed.  I asked this using the .Net engine http://www.experts-exchange.com/Database/MS-SQL-Server/Q_28553621.html and seem to not be making it very far.

It made me think that this has to be a common issue that maybe i'm not looking at it the right way.  Is there a way to use SQL Server Triggers or procedures to compare the hashed passwords.   For example, I have a PasswordHistory table in the database that stores the history of the hashed password which are copies of the hashed password in the aspnet_Membership table for the users.  I imagine that you could create a temporary table that the password that is suggested is first inserted and then if it is a comparison reject the update of the membership table.  

I have no real idea how to write SQL Triggers or Procedures so I am reaching out to you all to see if there is an answer.  I've been working on this issue for 6 months and intensely the last three weeks.  Thank you in advance.
atljarmanAsked:
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Why do you need to reinvent the wheel? Just enforce the password policy in the SQL Server for the logins you want
SQLPasswordPolicy.PNGand then in the Local Security Policy (Start > Control Panel > Administrative Tools > Local Security Policy) adjust the policies as you need:
LocalPasswordPolicy.PNG
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atljarmanAuthor Commented:
Ok.  So the user names and passwords are stored in tables that are accessed and updated by .net.  I think that is different than sql server logon user and passwords.  I think your recpmmendation is kob th latter, correct?  Thank you for trying to help.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Aren't SQL Server logins?
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atljarmanAuthor Commented:
These are ASP .Net Membership SQL Server database passwords - This was solved on another question but will award points even though it was answering a different question.   I don't think I was asking the right question.
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Microsoft SQL Server 2008

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