protected override void RaisePostBackEvent(IPostBackEventHandler sourceControl, string eventArgument)
 {
        Type t = sourceControl.GetType();
        System.Reflection.PropertyInfo property = t.GetProperty("UniqueID");
        object uniqueID = property.GetValue(sourceControl, null);    //这个就是你引起回发服务器的控件ID
        base.RaisePostBackEvent(sourceControl, eventArgument);
}