C# DataGridView: How to set excel like comment red glyph in cell

Question

I am working with datagridview and now attaching text as a comment in cell tag property and when user mouse over there i am showing that comment text in tooltips but i want to place a red glyph at the bottom right corner of the cell like excel. i searched a lot google but found no solution. so please help me with sample code to achieve my goal.

Thanks

Answer 1

You can draw in CellPainting
A test by drawing a triangle in the cell (1,1) :

dataGridView1.CellPainting += new System.Windows.Forms.DataGridViewCellPaintingEventHandler(dataGridView1_CellPainting);  

CellPainting :

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)  
{  
    if (e.ColumnIndex == 1 && e.RowIndex == 1)  
    {  
        e.PaintBackground(e.CellBounds, true);  
        e.PaintContent(e.CellBounds);  
        using (SolidBrush brush = new SolidBrush(Color.FromArgb(255, 0, 0)))  
        {  
            Point[] pt = new Point[] { new Point(e.CellBounds.Right - 1, e.CellBounds.Bottom - 10), new Point(e.CellBounds.Right - 1, e.CellBounds.Bottom - 1), new Point(e.CellBounds.Right - 10, e.CellBounds.Bottom - 1) };  
            e.Graphics.FillPolygon(brush, pt);  
        }  
        e.Handled = true;  
    }  
}