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FrameworkElement.Margin Property

Gets or sets the outer margin of an element.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)

public Thickness Margin { get; set; }
    <Thickness Left="left" Top="top" Right="right" Bottom="bottom"/>
<object Margin="left,top,right,bottom"/>
- or -
<object Margin="left,top"/>
- or -
<object Margin="thicknessReference"/>

XAML Values

left, top, right, bottom

Number values between 0 and PositiveInfinity that specify the four possible dimension properties of a Thickness structure.

The attribute usage will also accept abbreviated values that apply in the order provided, symmetrically and logically. For instance, Margin="20" will be interpreted to mean a Thickness with all properties set to 20. Margin="20,50" will be interpreted to mean a Thickness with Left and Right set to 20, and Top and Bottom set to 50.

The default unit for a Thickness measure is device-independent unit (1/96th inch). You can also specify other units by appending the unit type strings cm, in, or pt to any measure.

Number values provided as XAML attributes need not specify decimal points (0 is acceptable, does not have to be provided as 0.0). For more information on Extensible Application Markup Language (XAML) usage, see Thickness.


An object reference to an existing Thickness. This might be a {Binding}}, a {StaticResource}, or {DynamicResource}} reference. For more information on Extensible Application Markup Language (XAML) usage, see Thickness.

Property Value

Type: System.Windows.Thickness
Provides margin values for the element. The default value is a Thickness with all properties equal to 0 (zero).

Identifier field


Metadata properties set to true


The margin is the space between this element and other elements that will be adjacent when layout creates the user interface (UI). Shared elements might be peer elements (such as other elements in the collection of a common parent control), or might also be this element's parent.

Margin is set as a Thickness structure rather than as a number so that the margin can be set asymmetrically. The Thickness structure itself supports string type conversion so that you can specify an asymmetric Margin in XAML attribute syntax also.

A non-zero margin applies space outside the element layout's ActualWidth and ActualHeight.

Margins are additive for sibling elements in a layout; for example, two adjacent elements both with a margin of 30 set on the adjoining edge would have 60 units of space between them.

Elements that have margins set will not typically constrain the size of the specified Margin if the allotted rectangle space is not large enough for the margin plus the element content area. The element content area will be constrained instead when layout is calculated. The only case where margins would be constrained also is if the content is already constrained all the way to zero.

This example describes how to set the Margin property, by changing any existing property value for the margin in code-behind. The Margin property is a property of the FrameworkElement base element, and is thus inherited by a variety of controls and other elements.

This example is written in Extensible Application Markup Language (XAML), with a code-behind file that the XAML refers to. The code-behind is shown in both a C# and a Microsoft Visual Basic version.

<Button Click="OnClick" Margin="10" Name="btn1">
Click To See Change!!</Button>

void OnClick(object sender, RoutedEventArgs e)
    // Get the current value of the property.
    Thickness marginThickness = btn1.Margin;
    // If the current leftlength value of margin is set to 10 then change it to a new value.
    // Otherwise change it back to 10.
    if(marginThickness.Left == 10)
         btn1.Margin = new Thickness(60);
    } else {
         btn1.Margin = new Thickness(10);

.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.