Validating data when an item is added to a list
In this recipe, we will learn how to create a custom event handler for the ItemAdding synchronous event. We will validate the data that is being added to the contact list. We will validate the format of the phone number and e-mail address. The phone number should be of U.S. format. It must consist of three numeric characters, optionally enclosed in parenthesis, followed by a set of three numeric characters, and a set of four numeric characters. The e-mail should follow the standard e-mail notation. We will not allow users to enter some garbage information in these fields. If the data fails, our custom validation will cancel the event so that the data is not inserted into the list.
Getting ready
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