c# quick code to evaluate input using switch statement

 Figure this would be handy to have, so i can re-use over and over again without too much thinking

A sample code to evaluate both string and date time using switch statement.

public CreditCardValidationResult Validate(string cardNumber, DateTime date)

{

    int a = 100;

    int total = a switch

    {

        var s when s > 0 && s < 100 => 10000,

        var s when s > 101 && s < 200 => 20000

        _ => -1

    };

    string cardType = cardNumber switch

    {

        var s when s.StartsWith("4") => "VISA",

        var s when s.StartsWith("51") || s.StartsWith("52") || s.StartsWith("53")

|| s.StartsWith("54") || s.StartsWith("55") || s.StartsWith("37")

=> "MASTER",

        var s when s.StartsWith("34") || s.StartsWith("37") => "AMEX",

        _ => "unknown"

    };

    bool cardValid = date switch

    {

        var s when s >= DateTime.Now => true,

        _ => false

    };              

    return new CreditCardValidationResult(cardType, cardValid);

}