Returns or sets the dash style for the specified line. Can be one of the following MsoLineDashStyle constants: msoLineDash, msoLineDashDot, msoLineDashDotDot, msoLineDashStyleMixed, msoLineLongDash, msoLineLongDashDot, msoLineRoundDot, msoLineSolid, or msoLineSquareDot. Read/write Long.