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How to validate time text box in c#.net?
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How to validate time text box in c#.net?
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Use Regular Expression!

On focusout of textbox or any other event based on your need when you want to verify, check the text in the textbox with a regular expression and see if it's a valid one or not.

If it's in a particular format: 0-24 hours format, then you can even directly check for the hour, minute, second range as it's not that complicated.
 
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May I suggest to use a DateTimePicker instead? It is simpler and easier to use by you and by the user.
 
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Updated 3-Sep-10 23:03pm
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