I've got a VS 2005 app that I've got to make some modifications to. I've got to add a time element to gathering a date. What I'm thinking of doing is allowing the user to enter the date (as they always have been able to) and now the time, and associate that with a new user control that I've got to write. I'd like to upgrade this application to either VS 2008 or VS 2010, and hopefully I'll be able to do that. (There are some open source code apps that we've got in it, which stitch together .PDF files that we generate from Crystal Reports, so that's where I'm not sure how will this will all go.)
Anyway, this date/time user control that I've got to write will have to ensure that they user entered both values, so I'll use a couple of required field validators. That's all fine and good, but what I'd like to know is if it is possible to piggy back onto the event of the user not entering the required values? Is there an event of the required field validator I can put code into, so that I can either play some audio file (as in, "You must enter something") and/or show a video? If so, what is it?
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