c# graphics.drawline on datagridview

Question

I have the following code:

using (Pen gridPen = new Pen(Color.Black, 1))
        {
           if ((e.RowIndex % 4) == 0)
           {
               e.Graphics.DrawLine(gridPen, e.CellBounds.X, e.CellBounds.Top-1, e.CellBounds.Right-1, e.CellBounds.Top-1);
           }
        }

This does draw the grid lines on the datagridview every 4 rows (as required), but when I scroll on the datagridview the lines disappear, then sometimes re-appear again. Anybody know why? Thanks.

Answer 1

I didn't test it, Try to call Invalidate method for the DataGrid in Scroll event handler.

Good luck!