Answers for "string was not recognized as a valid datetime ddmmyy in c#"

was not recognized as a valid DateTime

DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);

System.FormatException: 'String '09-03-2020' was not recognized as a valid DateTime.'

this.Text="22/11/2009";

DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", null);