public void DeletePropertyGroupsAsync(long[] propertyGroupIds, object userState) { if ((this.DeletePropertyGroupsOperationCompleted == null)) { this.DeletePropertyGroupsOperationCompleted = new System.Threading.SendOrPostCallback(this.OnDeletePropertyGroupsOperationCompleted); } this.InvokeAsync("DeletePropertyGroups", new object[] { propertyGroupIds}, this.DeletePropertyGroupsOperationCompleted, userState); }