c#2_13.cs

private void Button_Click(object sender, EventArgs e)
{
    var button = (Button)sender;
     int column = Grid.GetColumn(button);
     int row = Grid.GetRow(button);
     if (gameActive && fields[column][row] == Player.None)
     {
         var currentSymbol = "";
         if (currentPlayer == Player.Player1)
         {
             currentSymbol = "X";
         }
         else
         {
             currentSymbol = "O";
         }
         button.Content = currentSymbol;
         fields[column][row] = currentPlayer;
         fieldsMarked++;
         var playerWon = CheckForWinner();
         if (playerWon)
         {
             GameInformation.Content = $"{currentSymbol} hat gewonnen!";
             gameActive = false;
         }
      else
         {
             if (fieldsMarked >= 9)
             {
                 GameInformation.Content = "Unentschieden!";
                 gameActive = false;
             }
             else if (currentPlayer == Player.Player1)
             {
                 currentPlayer = Player.Player2;
                 GameInformation.Content = "O ist am Zug";
             }
             else
             {
                 currentPlayer = Player.Player1;
                 GameInformation.Content = "X ist am Zug";
             }
         }
     }
 }