You can't as far as I know but then again you may be able to subclass the control. You can however use a standard textbox control and set its initial text to " / / ", then test for numbers on keypress to make sure user is entering numbers and if user has entered a number then you would replace the first space with what the user has entered. On the other hand you could use the DTPicker(date time picker) control with a custom format if needed and just allow the user to pick the date.
Good Luck
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Posting Virtuoso
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