public void SetSeparator(DataGridViewRow row, CustomCellBorderStyle separator)
 {
     foreach (DataGridViewCell cell in row.Cells)
     {
         if (cell is DataGridViewBorderedTextBoxCell)
         {
             ((DataGridViewBorderedTextBoxCell)cell).Border = separator;
         }
     }
 }
 public void SetSeparator(int index, CustomCellBorderStyle separator)
 {
     SetSeparator(Rows[index], separator);
 }