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Returns the preset gradient type for the specified fill.
PresetGradientType PresetGradientType { get; }
ReadOnly Property PresetGradientType As PresetGradientType
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 20, 20, 100, 60);
IFillFormat fillFormat = shape.Fill;
fillFormat.PresetGradient(GradientStyle.Vertical, 4, PresetGradientType.CalmWater);
PresetGradientType gradientType = fillFormat.PresetGradientType;