c# visual studios

Hello, I am getting an error message on the C# hangman program that i'm trying to recreate from a YouTube video at: https://www.youtube.com/watch?v=E8XQ9x-7yYk the program seems to run fairly well, but runs into an error once in a while. I'm not sure what code is needed to display the problem...

hello, I am re-creating a application that was posted on youtube. Its a Tic-Tac-Toe game. Here is the link if you are interested: https://www.youtube.com/watch?v=p3gYVcggQOU the problem that I am having that happens around 25.28 in the video. The problem that I am having is that there are...