Updated: February 2010
Gets a value that contains the horizontal size of the content's viewport. This is a dependency property.
Assembly: PresentationFramework (in PresentationFramework.dll)
Metadata properties set to true
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.