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Gets or sets the cap style for the end of the line. Can be one of the LineCapStyle constants.
LineCapStyle CapStyle { get; set; }
Property CapStyle As LineCapStyle
IShape connector = worksheet.Shapes.AddConnector(ConnectorType.Straight, 10, 10, 200, 100);
ILineFormat line = connector.Line;
line.CapStyle = LineCapStyle.Round;
LineCapStyle style = line.CapStyle;