Deduct points from score if invalid word entered

Under HaveTurn, you'll see this bit of code:

// something here ...
if (!ValidWord)
                    {
                        Console.WriteLine();
                        Console.WriteLine("Not a valid attempt, you lose your turn.");
                        Console.WriteLine();
                    }
// something here...

You can deduct a number of points from the player's score by adding one line:

// something here ...
if (!ValidWord)
                    {
                        Console.WriteLine();
                        Console.WriteLine("Not a valid attempt, you lose your turn.");
                        PlayerScore = PlayerScore - 10;
                        Console.WriteLine();
                    }
// something here...

Another thing you could do is deduct a number of points equal to what the word's score would have been if it was valid, so longer invalid words cost you more points than shorter invalid words.

// something here ...
if (!ValidWord)
                    {
                        Console.WriteLine();
                        Console.WriteLine("Not a valid attempt, you lose your turn.");
                        PlayerScore = PlayerScore - GetScoreForWord(Choice, TileDictionary);
                        Console.WriteLine();
                    }
// something here...