Automatically fits column width to the minimum size required for all data in the column to be visible.
Auto-fit column width is a MS Excel feature and not a XLS file format feature. When columns are auto-fit in MS Excel user interface, MS Excel will calculate current character widths and set column width to the new numeric value.
This method will set Width to the approximate value (maxCharCount * 340).
ExcelColumn Class | GemBox.Spreadsheet Namespace