The ClientSideEvents object maintains the names of JavaScript functions that are to be called on the client side in response to various events that can be processed without the need for a server post-back.
'Declaration Public ReadOnly Property ClientSideEvents As ClientSideEvents
public ClientSideEvents ClientSideEvents {get;}
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