public void VerifyTilesAsync() { VerifyTileDelg Delg; AsyncCallback callbackdelg; Delg = this.VerifyTiles; callbackdelg = this.CallbackFunc; ITMBizControllerCallback cb = OperationContext.Current.GetCallbackChannel <ITMBizControllerCallback>(); Delg.BeginInvoke(callbackdelg, cb); }