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private bool over55 = false; private void gridDataBoundGrid1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) { int row, col; this.gridDataBoundGrid1.PointToRowCol( new Point( e.X, e.Y), out row, out col); if ( col == 5 && row == 5 && !over55) { if ( myToolTip.Active == true) { Debug.WriteLine( "De-activating hover"); myToolTip.Active = false; } else { Debug.WriteLine( "Activating hover"); myToolTip.SetToolTip( this.gridDataBoundGrid1, "hello from tooltip"); myToolTip.Active = true; } over55 = true; } if ( col != 5 || row != 5) over55 = false; }