Hi Enjoyear,
Take a look at All Examples\Printing\Printed Chart Appearance example - it shows how to clone the current chart document and modify it before printing and print preview occurs - the example modifies the chart to gray scale pie, but you can use the same approach to turn off the visibility of the scrollbars using the scrollbar visible property:
chart.Axis(StandardAxis.PrimaryX).Scrollbar.Visible = false;