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Gets or sets the corners style of two intersecting lines. Can be one of the LineJoinStyle constants.
LineJoinStyle JoinStyle { get; set; }
Property JoinStyle As LineJoinStyle
IShape connector = worksheet.Shapes.AddConnector(ConnectorType.Straight, 10, 10, 200, 100);
ILineFormat line = connector.Line;
line.JoinStyle = LineJoinStyle.Round;
LineJoinStyle style = line.JoinStyle;