Gets or sets the value to be added to or subtracted from the ScrollBar.Value property when the scroll box is moved a small distance.
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When the user presses one of the arrow keys or clicks one of the scroll bar buttons, the ScrollBar.Value property changes according to the value set in the ScrollBar.SmallChange property.
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.