System.FormatException: 'An error occurred while deserializing the lastupdated property of class MongoDBAPI.Models.Masmoemis: String '19-10-2020 10:27:39' was not recognized as a valid DateTime.' code example

Example: 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);