ASP validation controls

I need to apply a set of business rules to two textboxes.   Any suggestions on how to implement and which ASP validation control or controls to use?   I have an Agency ID and an County ID textbox.  The rules are:

    1) County ID <> agency ID
    2) Agency ID starts with "01" or "02"; Agency ID is 6 digits exactly and numeric only.
    3) Neither can be "000000", "111111", "222222", etc.
    4) Neither can be "123456", "987654", etc.  Any series of sequential numbers/characters.
    5) County ID is alphanumeric, must be at least 6 characters and not more than 20 characters.
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Shaun KlineLead Software EngineerCommented:
You can use the CompareValidator for #1 and a RegularExpressionValidator for 2 - 5. If you wish to do it all in one validator, the CustomValidator is your best option.
Here's a page I referenced when I had to do custom validation:

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