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 public MainWindow()
 {
     InitializeComponent();
 }

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namespace TicTacToe
 {
     class Player
     {
     }
 }

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public enum Player
 {
     None,
     Player1,
     Player2
 }

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private List> fields = new List>()
 {
     new List() {Player.None, Player.None, Player.None},
     new List() {Player.None, Player.None, Player.None},
     new List() {Player.None, Player.None, Player.None},
 };
 private Player currentPlayer = Player.Player1;
 private bool gameActive = true;

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public MainWindow()
 {
     InitializeComponent();
     GameInformation.Content = "X ist am Zug";
 }

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private void Button_Click(object sender, EventArgs e)
{

}

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var button = (Button)sender;
int column = Grid.GetColumn(button);
int row = Grid.GetRow(button);

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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)
         {

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<Button Click="Button_Click" Name="Button0_0" Grid.Column="0" Grid.Row="0" Style="{StaticResource CellStyle}" />
<Button Click="Button_Click" Name="Button0_1" Grid.Column="0" Grid.Row="1" Style="{StaticResource CellStyle}" />
<Button Click="Button_Click" Name="Button0_2" Grid.Column="0" Grid.Row="2" Style="{StaticResource CellStyle}" />
...

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private bool CheckForWinner()
 {
     // Check rows
     foreach (List row in fields)
     {
         if (row[0] != Player.None && row[0] == row[1] && row[1] == row[2])
         {
             return true;
         }
     }