add number of rows to tableLayoutPanel at runtime VS 2008

private void btnaddrow_Click(object sender, EventArgs e)
        {
            tableLayoutPanel1.GrowStyle = TableLayoutPanelGrowStyle.AddRows;
            tableLayoutPanel1.AutoSize = true;

            int InsertRowNum = tableLayoutPanel1.RowCount;
            tableLayoutPanel1.AutoScroll = true;
            tableLayoutPanel1.Visible = true;

            RowStyle newRowStyle = new RowStyle();
            newRowStyle.SizeType = SizeType.Absolute;
            newRowStyle.Height = 30;
            tableLayoutPanel1.RowStyles.Insert(InsertRowNum, newRowStyle);

            tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(SizeType.Absolute, 30));
            // Add controls to the new row
            for (int row = 0; row < tableLayoutPanel1.RowCount; row++)
            {
                for (int column = 0; column < tableLayoutPanel1.ColumnCount; column++)
                {
                    TextBox textBox = new TextBox();
                    textBox.Text = string.Format("TextBox({0}, {1}) ", column, row);
                    tableLayoutPanel1.Controls.Add(textBox, column, row);
                }
                
            }
            

            tableLayoutPanel1.TabIndex++;
            tableLayoutPanel1.Visible = true;


        }