_3D_Madness.Board.CheckBounds C# (CSharp) Méthode

        private bool CheckBounds(int x, int y, int textInd)
        {
            Element next = elements[textInd];
            if (x > 1 && x < 19 && y > 1 && y < 19) {
                if (_board[x - 1][y].Texture == txt1 && _board[x + 1][y].Texture == txt1 && _board[x][y - 1].Texture == txt1 && _board[x][y + 1].Texture == txt1)
                    return false;
                if ((next.leftEdge == _board[x - 1][y].rightEdge || _board[x - 1][y].Texture == txt1 || (next.leftEdge == _board[x - 1][y].rightEdge + 1) || (next.leftEdge == _board[x - 1][y].rightEdge - 1)) &&
                    (next.rightEdge == _board[x + 1][y].leftEdge || _board[x + 1][y].Texture == txt1 || next.rightEdge == _board[x + 1][y].leftEdge + 1 || next.rightEdge == _board[x + 1][y].leftEdge - 1) &&
                    (next.upEdge == _board[x][y + 1].bottomEdge || _board[x][y + 1].Texture == txt1 || next.upEdge == _board[x][y + 1].bottomEdge + 1 || next.upEdge == _board[x][y + 1].bottomEdge - 1) &&
                    (next.bottomEdge == _board[x][y - 1].upEdge || _board[x][y - 1].Texture == txt1 || next.bottomEdge == _board[x][y - 1].upEdge + 1 || next.bottomEdge == _board[x][y - 1].upEdge - 1))
                    return true;
                else
                    return false;
            } else
                return true;
        }