private void MergeCellsInColumn(int col, int row1, int row2)
{
Graphics g = DG.CreateGraphics();
Pen p = new Pen(DG.GridColor);
Rectangle r1 = DG.GetCellDisplayRectangle(col, row1, true);
Rectangle r2 = DG.GetCellDisplayRectangle(col, row2, true);
int recHeight = 0;
string recValue = string.Empty;
for (int i = row1; i <= row2; i++)
{
recHeight += DG.GetCellDisplayRectangle(col, i, true).Height;
if (DG[col, i].Value != null)
{
recValue += DG[col, i].Value.ToString() + " ";
}
}
Rectangle newCell = new Rectangle(r1.X, r1.Y, r1.Width, recHeight);
g.FillRectangle(new SolidBrush(DG.DefaultCellStyle.BackColor), newCell);
g.DrawRectangle(p, newCell);
g.DrawString(recValue, DG.DefaultCellStyle.Font, new SolidBrush(DG.DefaultCellStyle.ForeColor), newCell.X + 3, newCell.Y + 3);
}