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Window.Topmost Property

Gets or sets a value that indicates whether a window appears in the topmost z-order.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public bool Topmost { get; set; }
<object Topmost="bool" .../>

Property Value

Type: System.Boolean
true if the window is topmost; otherwise, false.

Identifier field

TopmostProperty

Metadata properties set to true

None

A window whose Topmost property is set to true appears above all windows whose Topmost properties are set to false.

In the group of windows that have Topmost property is set to true, the window that is currently activated is the topmost window. Likewise for the group of windows that have Topmost property is set to false.

NoteNote

You cannot set or get this property when a window is hosted in a browser.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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