'Declaration Public Overrides ReadOnly Property Controls As ControlCollection
public override ControlCollection Controls {get;}
On an ASP.NET page, when controls are added declaratively between the opening and closing tags of a server control, ASP.NET automatically adds the controls to the containing server control's ControlCollection. Any HTML tags or text strings that are not processed on the server are treated as LiteralControl objects. These are added to the collection like other server controls.
The Controls property allows you programmatic access to the instance of the ControlCollection class for any server control. You can add controls to the collection, remove controls from the collection, or iterate through the server controls in the collection.
Target Platforms: Windows 10, Windows 8.1, Windows 8, 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