Problem with ParseExact

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I get an error if I try to convert string to datetime:


dim dtDateTime as datetime
dtDateTime = DateTime.ParseExact("05/07/2006 12:00", "MM/dd/yyyy HH:mm", Nothing)

I tried also with


dim dtDateTime as datetime
dtDateTime = DateTime.ParseExact("05/07/2006 12:00", "MM/dd/yyyy HH:mm", System.Globalization.DateTimeFormatInfo.InvariantInfo)

but I get the same error.
Any suggestions?

Thank