public void UpdatePropertyGroupsAsync(PropGrp[] propertyGroups, object userState) { if ((this.UpdatePropertyGroupsOperationCompleted == null)) { this.UpdatePropertyGroupsOperationCompleted = new System.Threading.SendOrPostCallback(this.OnUpdatePropertyGroupsOperationCompleted); } this.InvokeAsync("UpdatePropertyGroups", new object[] { propertyGroups}, this.UpdatePropertyGroupsOperationCompleted, userState); }