/// <summary> /// Extends BeginInvoke so that when a state object is not needed, null does not need to be passed. /// <example> /// statusbardrawitemeventhandler.BeginInvoke(sender, sbdevent, callback); /// </example> /// </summary> public static IAsyncResult BeginInvoke(this StatusBarDrawItemEventHandler statusbardrawitemeventhandler, Object sender, StatusBarDrawItemEventArgs sbdevent, AsyncCallback callback) { if (statusbardrawitemeventhandler == null) { throw new ArgumentNullException("statusbardrawitemeventhandler"); } return(statusbardrawitemeventhandler.BeginInvoke(sender, sbdevent, callback, null)); }