DbConnection.StateChange イベントとは？ わかりやすく解説

Public Event StateChange As
 StateChangeEventHandler

Dim instance As DbConnection
Dim handler As StateChangeEventHandler

AddHandler instance.StateChange, handler

public virtual event StateChangeEventHandler StateChange

public:
virtual event StateChangeEventHandler^ StateChange {
    void add (StateChangeEventHandler^ value);
    void remove (StateChangeEventHandler^ value);
}

/** @event */
public void add_StateChange (StateChangeEventHandler
 value)

/** @event */
public void remove_StateChange (StateChangeEventHandler
 value)

JScript では、イベントは使用できますが、新規に宣言することはできません。