Applies a style to the column. When a style is applied - rather than set (see ColumnProperties.Style ) - only the differences between the new style and style properties previously assigned to the column (through the ExcelWriter API or in Microsoft Excel) will take effect. For example, if a cell in the column has a background color and the new style applied does not contain a background color, the cell's color will not be affected.

 public void ApplyStyle(Style style)
Public Sub ApplyStyle(ByVal style As Style)

The Style object to apply to the row.

colProps.ApplyStyle(styl);
colProps.ApplyStyle(styl)