CRM 2011-Silverlight Retrieve Multiple query

   public static void LoadProducts(string txt)
            {
            try
                {
                DataServiceQuery<Product> query = (DataServiceQuery<Product>)context.ProductSet.Where<Product>(a => a.ProductNumber.StartsWith(txt) );
                query.BeginExecute(OnReapirGunModelComplete1, query);
                }
            catch (Exception ex)
                {
                _syncContext.Send(new SendOrPostCallback(showErrorDetails), ex);
                }
            }
        private static void OnReapirGunModelComplete1(IAsyncResult result)
            {
            try
                {
                DataServiceQuery<Product> results = result.AsyncState as DataServiceQuery<Product>;
                List<Product> tmp = new DataServiceCollection<Product>(results.EndExecute(result)).ToList<Product>();
                if (tmp.Count > 0)
                    {
                   //your code
                    }
                }
            catch (Exception ex)
                {
                _syncContext.Send(new SendOrPostCallback(showErrorDetails), ex);
                }
            }