How can I format a nullable DateTime with ToString()?

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How can I convert the nullable DateTime dt2 to a formatted string?

DateTime dt = DateTime.Now;
Console.WriteLine(dt.ToString("yyyy-MM-dd hh:mm:ss")); //works

DateTime? dt2 = DateTime.Now;
Console.WriteLine(dt2.ToString("yyyy-MM-dd hh:mm:ss")); //gives following error:

no overload to method ToString takes
one argument

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