textbox validation

hi, quick question, i want to add validation to a text box on my form, what is the easiest way.

the textbox stores time, so i want it to be able to type in 1200 and it split the string and add a : sign, so it would add it as 12:00?

thanks
kipl20Asked:
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oobaylyConnect With a Mentor Commented:
If it's a windows form, you could use a MaskedTextBox control and set the mask property to "0000".

Better yet you could use a DateTimePicker control, and set the Format property to  DateTimePickerFormat.Custom, the CustomFormat property to "HH:mm" and the ShowUpDown property to true.
Then you can retrieve the time as a string using:
Dim timeString As String = dateTimePicker1.Value.ToString("HH:mm")
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