private void grdData_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
 {
     if (e.RowIndex < 0 || e.ColumnIndex < 0)
     {
         return;
     }
     this.toolTip.Hide(this.grdData);
     if (e.ColumnIndex >= 0 && e.RowIndex >= 0)
     {
         DataGridViewRow row = grdData.Rows[e.RowIndex];
         string          strCellToolTipText = DataGridViewHelper.GetDataRowInfo(grdData, row);
         this.toolTip.Show(strCellToolTipText, this.grdData);
     }
 }