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Gets or sets the style used to display every cell in the range, creating a new style if necessary.
public CellStyle StyleNew { get; }
This property never returns null. If the range does not have a style assigned to it, a new style will be created automatically.
The code below creates a CellRange structure and uses it to apply a custom style to the entire range.
// create a cell range
CellRange rg = _flex.GetCellRange(1, 1, 5, 5);
// make sure range is red
rg.StyleNew.BackColor = Color.Red;