You typically do not inherit directly from the System.Windows.Forms.ScrollBar class. To create your own scroll bar class, inherit from the System.Windows.Forms.VScrollBar or System.Windows.Forms.HScrollBar class.

To adjust the value range of the scroll bar control, set the ScrollBar.Minimum and ScrollBar.Maximum properties. To adjust the distance the scroll box moves, set the ScrollBar.SmallChange and ScrollBar.LargeChange properties. To adjust the starting point of the scroll box, set the ScrollBar.Value property when the control is initially displayed.

User interface guidelines suggest that the ScrollBar.SmallChange and ScrollBar.LargeChange properties are set relative to the size of the view that the user sees, not to the total size including the unseen part. For example, if you have a picture box with scroll bars displaying a large image, the ScrollBar.SmallChange and ScrollBar.LargeChange properties should be set relative to the size of the picture box, not to the size of the image.