i have two datetime pickers in C#. one for the start date and the other for the end date. when a user selects a value in the start datetime picker it should validate that the user cannot select for a date that have passed. how to validate this.
and also when then user selects a value in the second datetime picer it should validate that the users cannot select the start datetime that was entered or a past date. how can i validate this in C#.