Validation spanning a group of text boxes

I'm trying to achieve the following:

Where:

• Surname is always required
• NI Number OR Reference Number is required

Is this beyond the scop开发者_如何学JAVAe of the ASP.NET Validation Controls? The only solution I can think of is writing some bespoke javascript (for client side) and backing that up with some server side code.

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One thing you can try is to have a CustomValidator(see here) check that both textboxes are not empty. Then validate both textboxes with a regular expression. The expression should check for either a valid entry OR a blank field.

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You can create a CustomValidator and handle it there

http://msdn.microsoft.com/en-us/library/aa479013.aspx#aspnet-validateaspnetservercontrols_topic7