using System;

using System.Linq;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

       Task processLoadPartyTask = Task.WhenAll(Enumerable.Range(1, 10).Select(GetAndInsertLoadParties));

​

       foreach (int shipmentId in Enumerable.Range(1000, 10))

       {

           await UpsertShipmentAsync(shipmentId).ConfigureAwait(false);

       }

​

       await processLoadPartyTask.ConfigureAwait(false);

    }

    private static async Task UpsertShipmentAsync(int shipmentId)

    {

        Console.WriteLine($"UpsertShipment {shipmentId} Started");

        await Task.Delay(TimeSpan.FromMilliseconds(600)).ConfigureAwait(false);

        Console.WriteLine($"UpsertShipment {shipmentId} Completed");

    }

​

    private static async Task GetAndInsertLoadParties(int partyId)

    {

        Console.WriteLine($"GetAndInsertLoadParties {partyId} Started");

        await Task.Delay(TimeSpan.FromSeconds(partyId)).ConfigureAwait(false);

        Console.WriteLine($"GetAndInsertLoadParties {partyId} Completed");

    }

}