public void UpdatePropertyGroupAsync(PropGrp propertyGroup, object userState) { if ((this.UpdatePropertyGroupOperationCompleted == null)) { this.UpdatePropertyGroupOperationCompleted = new System.Threading.SendOrPostCallback(this.OnUpdatePropertyGroupOperationCompleted); } this.InvokeAsync("UpdatePropertyGroup", new object[] { propertyGroup}, this.UpdatePropertyGroupOperationCompleted, userState); }