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Gets the IInterior object that represents this style's fill formatting.
Use this property to access fill and pattern settings such as background color and pattern style for the style.
IInterior Interior { get; }
ReadOnly Property Interior As IInterior
IStyle style = workbook.Styles.Add("filledStyle");
style.Interior.Pattern = Pattern.Solid;
worksheet.Range["A1"].Style = style;
IInterior interior = style.Interior;