private void dataGridView1_MouseLeave(object sender, EventArgs e)
{
Rectangle mouseRect = new Rectangle(MousePosition, new Size(1, 1));
var rectC = dataGridView1.GetColumnDisplayRectangle(dataGridView1.Columns.Count - 1, true);
var right = rectC.Right;
var rectR = dataGridView1.GetRowDisplayRectangle(dataGridView1.Rows.Count - 1, true);
var bottom = rectR.Bottom;
var rect = new Rectangle(
dataGridView1.PointToScreen(dataGridView1.Location),
new Size(right, bottom));
if (!rect.IntersectsWith(mouseRect))
{
ttText.Hide(this);
}
}
