This txtboxempty validating
It is useful if you want to exclude a range of characters, for example, only allowing numeric values to be entered.
The Because more than one text box is using this method to handle the event, you cannot be sure which is calling the function.
The purpose of this example is to give you a good grounding in manipulating properties and using events, not to create something that is incredibly useful.
How It Works The job of setting up the visual part of the form is now complete.
The example you just completed is quite long compared to the others you will see in this chapter — this is because you build on this example rather than starting from scratch with each example.
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