C1RangeSlider control can be displayed Horizontally or Vertically, using Orientation property. By default, the control is oriented horizontally.

You can easily change the orientation through Orientation property in Properties pane, or through code:

To write code in Visual Basic

Me.c1RangeSlider1.Orientation = Orientation.Vertical

To write code in C#

this.c1RangeSlider1.Orientation = Orientation.Vertical;