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Returns the IFillFormat object that contains fill formatting properties for the specified chart or shape.
Use the returned IFillFormat object to configure fill settings such as solid fill, gradient fill, pattern, texture, color, and transparency.
IFillFormat Fill { get; }
ReadOnly Property Fill As IFillFormat
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 20, 20, 120, 60);
IFillFormat fill = shape.Fill;
fill.Solid();
fill.Color.RGB = Color.Blue;