Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
The value for a ScrollBar control is equivalent to the size of the scrollable content minus the size of the visible content area or viewport. For example, if the size of the content is 100 and the size of the ViewportSize property is 30, the value of the property is 70. This is true because the Value property of the ScrollBar control corresponds to the position in the scrollable content that appears at the top of the viewport. When the content is scrolled to the very bottom in this example, 30 percent of the content still appears in the viewport. Therefore, the Value that corresponds to the top of the viewport is 70, and the value is 70.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.