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Control.NamingContainer Property

Gets a reference to the server control's naming container, which creates a unique namespace for differentiating between server controls with the same Control.ID property value.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

abstract NamingContainer : Control
override NamingContainer : Control

Property Value

Type: System.Web.UI.Control
The server control's naming container.

Each page in an ASP.NET Web application contains a hierarchy of controls. This hierarchy is not dependent on whether a control generates UI visible to the user. The naming container for a given control is the parent control above it in the hierarchy that implements the INamingContainer interface. A server control that implements this interface creates a unique namespace for the ID property values of its child server controls. You can use the NamingContainer property of a naming container's child control to get a reference to its parent container.

Creating a unique namespace for server controls is particularly important when you bind Web server controls to data, such as the Repeater and DataList server controls. When multiple entries in the data source create multiple instances of a server control that is a child of the repeating control, the naming container ensures that each instance of these child controls have UniqueID property values that do not conflict. The default naming container for a page is the instance of the Page class that is generated when that page is requested.

The ClientID property contains the value that is rendered as the element's id attribute in the HTML markup. Depending on the value that you assign to the ClientIDMode property, the value that is generated for the ClientID property might include the ID of the NamingContainer object. When you set ClientIDMode to Static, the ClientID value does not include the ID of the NamingContainer object. When you set ClientIDMode to either AutoID or Predictable, the ClientID value will include the ID from the NamingContainer object. For more information, see ASP.NET Web Server Control Identification.

The following example demonstrates using the NamingContainer property.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, 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.