char[,] grid = new char[3,3]; internal void Move(int position, char player)

public void Move(int position, char player)
  {
    var grid = new char[3, 3];

    for (int i = 0; i < grid.GetLength(0); i++)
    {
      for (int j = 0; j < grid.GetLength(0); j++)
      {
        if (grid[i, j] == 'X' || grid[i, j] == 'O')
        {
          return;
        }
  
        if (position == 1)
        {
          grid[0, 0] = player;
        }
        else if (position == 2)
        {
          grid[0, 1] = player;
        }
        else if (position == 3)
        {
          grid[0, 2] = player;
        }
        else if (position == 4)
        {
          grid[1, 0] = player;
        }
        else if (position == 5)
        {
          grid[1, 1] = player;
        }
        else if (position == 6)