CosmosDriver.cs

public async Task<List<Order>> GetOrders(string customerId)
{
      try
      {
            var sqlQueryText = "SELECT * FROM c WHERE c.CustomerId = @customerid";
            Console.WriteLine("Running query: {0}\n", sqlQueryText);
            QueryDefinition queryDefinition = new QueryDefinition(sqlQueryText).WithParameter("@customerid", "CU7-36-8183" );
            FeedIterator<Order> queryResultSetIterator = this._container.GetItemQueryIterator<Order>(queryDefinition);

            List<Order> orders = new List<Order>();

            while (queryResultSetIterator.HasMoreResults)
            {
              FeedResponse<Order> currentResultSet = await queryResultSetIterator.ReadNextAsync();
              foreach (Order order in currentResultSet)
              {
                  orders.Add(order);
                  Console.WriteLine("\tRead {0}\n", order.OrderId);
               }
            }

        return orders;
    }
    catch (CosmosException ex) 
    {
      Console.WriteLine("Exception occured in GetCustomer: {0} Message body is {1}.\n", ex.Message,ex.ResponseBody);
      throw ;
    }
}