/// <remarks/>
 public void findItemsByProductAsync(FindItemsByProductRequest findItemsByProductRequest, object userState) {
     if ((this.findItemsByProductOperationCompleted == null)) {
         this.findItemsByProductOperationCompleted = new System.Threading.SendOrPostCallback(this.OnfindItemsByProductOperationCompleted);
     }
     this.InvokeAsync("findItemsByProduct", new object[] {
                 findItemsByProductRequest}, this.findItemsByProductOperationCompleted, userState);
 }
 /// <remarks/>
 public void findItemsByProductAsync(FindItemsByProductRequest findItemsByProductRequest) {
     this.findItemsByProductAsync(findItemsByProductRequest, null);
 }