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            try
            {               
                MarketplaceWebServiceProductsClient client = new MarketplaceWebServiceProductsClient(accessKey,secretKey);
                
                GetMyPriceForASINRequest request = new GetMyPriceForASINRequest();

                                               
                ASINListType list = new ASINListType();
                list.ASIN.Add(asin);                    //asin ist ein string

                request.WithASINList(list);
                request.WithMarketplaceId(marketplaceID);
                request.WithSellerId(sellerId);                            
                                    
                GetMyPriceForASINResponse response = new GetMyPriceForASINResponse();
            
                response = client.GetMyPriceForASIN(request);    //Hier sagt er "reqest wäre nicht auf eine Objektinstanz festgelegt...
                                                 
            }
            catch(MwsException ex)
            {
                MessageBox.Show(ex.ToString());
            }