Object reference not set error 2D array

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C#

I am trying to set a name for a particular button from the array but once i try run it, it would send me an error that goes "Object reference not set to an instance of an object". I am new to c#, how can I solve this problem?

Button[,] btnSeat = new Button[8, 6];
    private void initializeBoard()
    {
        bool cutoff;
        for (int i = 0; i <= 7; i++)
        {
            for (int j = 0; j <= 5; j++)
            {
                cutoff = true;
                if (i == 2 || i == 3 || i == 4 || i == 5)
                {
                    if (j == 4 || j == 5)
                    {
                        cutoff = false;

                    }
                }
                if (cutoff == true)
                {
                    btnSeat[i, j] = new Button();
                    btnSeat[i, j].Width = 80;
                    btnSeat[i, j].Height = 80;

                    btnSeat[i, j].Left = (90 * i);
                    if (i == 2) btnSeat[i, j].Left = (120 * i);
                    if (i == 3) btnSeat[i, j].Left = (110 * i);
                    if (i == 4) btnSeat[i, j].Left = (130 * i);
                    if (i == 5) btnSeat[i, j].Left = (122 * i);
                    if (i == 6) btnSeat[i, j].Left = (125 * i);
                    if (i == 7) btnSeat[i, j].Left = (120 * i);


                    btnSeat[i, j].Top = (90 * j);
                    btnSeat[i, j].Image = Image.FromFile("../../monitor.png");
                    pnlSeat.Controls.Add(btnSeat[i, j]);
                    String buttonName = "btn" + i + j;
                    btnSeat[i, j].Name = buttonName;
                    btnSeat[i, j].Text = buttonName;
                    btnSeat[i, j].Click += new EventHandler(seat_Click);

                    btnSeat[0, 0].Text = "192.168.1.2";
                    btnSeat[0, 1].Text = "192.168.1.5";
                    btnSeat[0, 2].Text = "192.168.1.8"; 
                    if (btnSeat[i, j].Text == clientIP)
                    {
                        btnSeat[i, j].Image = Image.FromFile("../../ol.png");
                        btnSeat[i, j].BeginInvoke(new MethodInvoker(() => btnSeat[i, j].Text = sClientHost));

                    }

                }
            }
        }

    }