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Control.ID Property

Gets or sets the programmatic identifier assigned to the server control.

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

'Declaration
<ThemeableAttribute(False)> _
Public Overridable Property ID As String

Property Value

Type: System.String
The programmatic identifier assigned to the control.

Setting this property on a server control provides you with programmatic access to the server control's properties, events, and methods. This property can be set by Web developers by declaring an ID attribute in the opening tag of an ASP.NET server control.

If this property is not specified for a server control, either declaratively or programmatically, you can obtain a reference to the control through its parent control's Controls property.

NoteNote

Only combinations of alphanumeric characters and the underscore character ( _ ) are valid values for this property. Including spaces or other invalid characters will cause an ASP.NET page parser error.

Sub Page_Init(sender As Object, e As EventArgs)
   ' Add a event Handler for 'Init'.
   AddHandler myControl.Init, AddressOf Control_Init
End Sub

Sub Control_Init(sender As Object, e As EventArgs)
   Response.Write(("The ID of the object initially : " + myControl.ID))
   ' Change the ID property.
   myControl.ID = "TestControl"
   Response.Write(("<br />The changed ID : " + myControl.ID))
End Sub

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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