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Returns the gradient style for the specified fill.
GradientStyle GradientStyle { get; }
ReadOnly Property GradientStyle As GradientStyle
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 20, 20, 100, 60);
IFillFormat fillFormat = shape.Fill;
fillFormat.TwoColorGradient(GradientStyle.FromCenter, 1);
GradientStyle style = fillFormat.GradientStyle;