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Gets or sets how a data bar is filled with color.
The DataBarFillType value specifies whether the data bar uses a solid fill or a gradient fill.
DataBarFillType BarFillType { get; set; }
Property BarFillType As DataBarFillType
worksheet.Range["A1:A3"].Value = new object[,] {{10}, {30}, {20}};
IDataBar dataBar = worksheet.Range["A1:A3"].FormatConditions.AddDatabar();
dataBar.BarFillType = DataBarFillType.Gradient;
DataBarFillType fillType = dataBar.BarFillType;