Application.RootVisual Property

Gets or sets the main application UI.

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

public UIElement RootVisual { get; set; }

Property Value

Type: System.Windows.UIElement
A UIElement that is the main application UI.


When setting this property, the specified value is not an instance of a class that derives from UIElement.

You can set the value of the RootVisual property only one time from code, although you get its value any number of times.

The following code example demonstrates how an application can use a Startup event handler to set the RootVisual property.

using System.Windows; // Application, StartupEventArgs

namespace SilverlightApplication
    public partial class App : Application
        public App()

        private void Application_Startup(object sender, StartupEventArgs e)
            // Specify the main application UI
            this.RootVisual = new Page();


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.