In C#, I am trying to check for a the dealer's natural Blackjack. I need help for this section of code:

// Check for natural blackjack

// If the dealer has a natural, he immediately collects the bets of all players

// who do not have naturals, (but no additional amount). If the dealer and another

// player both have naturals, the bet of that player is a push (a tie), and

// the player takes back his chips.

// If the dealer's face-up card is a ten-card or an ace, he looks at his face-down

// card to see if the two cards make a natural. If the face-up card is not a

// ten -card or an ace, he does not look at the face-down card until it is

// the dealer's turn to play.

// End Check