IColumnFormatting.ColumnWidth Property
If the value is set to a number less than 1, then the width will not be changed. This is most likely the case
when the column is hidden in which case the width is zero. This should be indicated by the HiddenByUser
property.
If the value is set to a number greater than 255, then the width will be automatically corrected to 255.
No exception will be thrown in such cases.
Available since QDV 7.18.655.