Merge cells in DataGridView

This is an example of merging cells vertically and horizontally in DataGridView.

Here is the code:

private void MergeCellsInRow(int row, int col1, int col2)
{
    Graphics g = dataGridView1.CreateGraphics();
    Pen p = new Pen(dataGridView1.GridColor);
    Rectangle r1 = dataGridView1.GetCellDisplayRectangle(col1, row, true);
    Rectangle r2 = dataGridView1.GetCellDisplayRectangle(col2, row, true);

    int recWidth = 0;
    string recValue = string.Empty;
    for (int i = col1; i <= col2; i++)
    {
	recWidth += dataGridView1.GetCellDisplayRectangle(i, row, true).Width;
	if (dataGridView1[i, row].Value != null)
	    recValue += dataGridView1[i, row].Value.ToString() + " ";
    }
    Rectangle newCell = new Rectangle(r1.X, r1.Y, recWidth, r1.Height);
    g.FillRectangle(new SolidBrush(dataGridView1.DefaultCellStyle.BackColor), newCell);
    g.DrawRectangle(p, newCell);
    g.DrawString(recValue, dataGridView1.DefaultCellStyle.Font, new SolidBrush(dataGridView1.DefaultCellStyle.ForeColor), newCell.X + 3, newCell.Y + 3);
}

private void MergeCellsInColumn(int col, int row1, int row2)
{
    Graphics g = dataGridView1.CreateGraphics();
    Pen p = new Pen(dataGridView1.GridColor);
    Rectangle r1 = dataGridView1.GetCellDisplayRectangle(col, row1, true);
    Rectangle r2 = dataGridView1.GetCellDisplayRectangle(col, row2, true);

    int recHeight = 0;
    string recValue = string.Empty;
    for (int i = row1; i <= row2; i++)
    {
	recHeight += dataGridView1.GetCellDisplayRectangle(col, i, true).Height;
	if (dataGridView1[col, i].Value != null)
	    recValue += dataGridView1[col, i].Value.ToString() + " ";
    }
    Rectangle newCell = new Rectangle(r1.X, r1.Y, r1.Width, recHeight);
    g.FillRectangle(new SolidBrush(dataGridView1.DefaultCellStyle.BackColor), newCell);
    g.DrawRectangle(p, newCell);
    g.DrawString(recValue, dataGridView1.DefaultCellStyle.Font, new SolidBrush(dataGridView1.DefaultCellStyle.ForeColor), newCell.X + 3, newCell.Y + 3);
}