Drawing horizontal and vertical gridlines

To draw horizontal and vertical gridlines we essentially use the same method used for the vertical gridline or column border used in the previous section. After drawing the vertical lines, we use GetItemRect() to get the item height and then we draw the horizontal grid lines based on this height. One implication of using GetItemRect() is that it fails when the list does not have any items in it and no horizontal line is drawn. Here is the complete code of the overridden OnPaint() function. Also note that the next version of the list view control will support the LVS_EX_GRIDLINES style and should make our code redundant.