事件

public delegate void OnDBOperate();
    public class UserControlBase : System.Windows.Forms.UserControl
    {
        public Button btnNew;
        public event OnDBOperate OnNew;
        private void toolBar_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
        {
            if (e.Button.Equals(btnNew))
            {
              
            }
        }
    }