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How to distinguish drag-and-drop at the top and at the bottom in Datagridview in Winform

Hi experts
I've, for example, a datagridview with 3 rows (only 1 single column).

When I drag-and-drop an item to under the bottom row, the hit-test row index returned was "-1".
When I drag-and-drop an item to above the first row (ie at the row header), the hit-test row index returned was also "-1".

My question is: how to distinguish the two situations. Thanks in advance.

 Point clientPoint = _dgv2.PointToClient(new Point(e.X, e.Y));
 int dropPosition = _dgv2.HitTest(clientPoint.X, clientPoint.Y).RowIndex;

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dominicwong
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dominicwong
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AndyAinscowCommented:
There may be a better way but if you check the y co-ordinate and compare that to the y co-ordinate of the grid on screen you should be able to tell if it is near the top of the grid ( = before the first row) or rather lower down ( = after the last row)
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AndyAinscowCommented:
ps.  The -1 indicates it is not over an existing row, I think you then have to use some indirect method to determine further.
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dominicwongAuthor Commented:
Thanks Andy. It works.
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