Please do help me!!!
i have to validate date using date time picker such that u can't choose the date /month/year before you were born.

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You don't need to validate, but to limit the datepicker.
Read here: http://msdn.microsoft.com/en-us/library/system.windows.forms.datetimepicker.mindate.aspx

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Instead of validating, you need to set your minimum allowed date on your DTP.

DateTimePicker1.MinDate = "date you want to set to"
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