Gets the horizontal position of the mouse.
Assembly: PresentationFramework (in PresentationFramework.dll)
When the user opens a context menu by right clicking the mouse, this property returns the position of the mouse. Specifying the position of the ContextMenu by setting the PlacementTarget, PlacementRectangle, Placement, HorizontalOffset, or VerticalOffsetProperty properties does not affect the value of .
When the user opens a context menu by using the keyboard, or when the context menu closes, the value of this property is -1.
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.