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The ASP.NET AJAX Masked Edit Extender control is used to mask the
TextBox control, limiting what values can be input into it.
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The Masked Edit Extender control provides visual aids to the user
as to what to enter in the TextBox being extended.
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The Masked Edit Extender is a great way to ensure users provide
valid numeric, date, time, or similar data which must conform to a particular
data format.