How do I assign two possible values to a single variable

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C#

Visual-Studio

C#7.0

Basically i am trying to make a Blackjack game in c#, a problem i'm having is that the Ace has two possible values, 1 and 11. I as wondering how i could give two values to A single, "int Count variable"

What I have tried:

I Found code for a black jack game online playing cards - C# Singleplayer Blackjack Game - Code Review Stack Exchange[^]

This basically used this

switch (Face)
            {
                case Ten:
                case Jack:
                case Queen:
                case King:
                    Value = 10;
                    break;
                case Ace:
                    Value = 11;
                    break;
                default:
                    Value = (int)Face + 1;
                    break;
            }

Firstly i was wondering how they converted a non numerical enum into an integer, and secondly how would this give it two values.

What i did was

if (Settings.FirstCard == "A" && Settings.SecondCard == "A")
                        {
                            Console.WriteLine("Your Cards are A and A");
                            Console.WriteLine("Your Count is 12");
                            Settings.FirstCount = 12;

                        }
                        else
                        {
                            if (Settings.FirstCard == "A")
                            {
                                Console.WriteLine("Your Cards are 'A' and {0}", Settings.SecondCard);
                                Console.WriteLine("Your Possible counts are {0} and {1}", Settings.SecondCount + 1, Settings.SecondCount + 11);
                            }
                            else
                            {
                                Console.WriteLine("Your Cards are {0} and A", Settings.FirstCard);
                                Console.WriteLine("Your Possible counts are {0} and {1}", Settings.FirstCount + 1, Settings.FirstCount + 11);
                            }
                        }

Although this worked fine for the initial deal, when a person would hit, it would fall apart