在c#接口中能定义事件吗?怎么定义,怎么实现?（举例）

好吧,为了五分,我拼了老命.
interface IEvent
{
EventHandler SampleEvent(object sender, EventArgs arg);
}
class Sample : IEvent
{
public EventHandler SampleEvent(object sender, EventArgs arg)
{
throw new NotImplementedException();
}
}