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How format textbox so "2" becomes "2.00"?

Stupid question for the day but weirdly I don't have this yet.

How can I format a textbox such that if the user enters a number like 4 it
will become (on validated) 4.00.

If they enter 5.1 it will become 5.10.

If they enter 1.239 it will become 1.24.

Thanks for the help.

Jun 1 '08 #1
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