Display tootlip when mouse over

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C#

Hallo, I have a program (desktop application), which display tooltip when I over with mouse on image with current position. Now it works on mouseClick, mouseDown and MouseHover but I need mouseOver, can anyone advice me how to do it? Ty a lot.

private void Form1_MouseDown(object sender, MouseEventArgs e)
     {
         if (e.X >= 89 && e.X <= 139 && e.Y >= 54 && e.Y <= 122)
         {
             tootltip.SetToolTip(this, "image");
         }
     }