TabControl.Orientation Enum
Definition
Section titled “Definition”Horizontal alignment modes
public enum TabControl.OrientationFields
Section titled “Fields”Tabs should be placed at the top of the control.
Top = 0Bottom
Section titled “Bottom”Tabs should be placed at the bottom of the control.
Bottom = 1Tabs should be placed to the left of the control.
Left = 2Tabs should be placed to the right of the control.
Right = 3