How to create a device identity for IotHub in VS-17

I am beginner of IOT and i learning to creating the app with IotHub by seeing the tutorial from this link:

https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-csharp-csharp-getstarted

i created the IotHub using Azure but I can't create an identity of my device.

Here's my code :

using System;
using System.Threading.Tasks;
using Microsoft.Azure.Devices;
using Microsoft.Azure.Devices.Common.Exceptions;
namespace DeviceIdentity
{
class Program
{
static RegistryManager Registrymanager;
static string connectionString = "{iot hub connection string}";
private static async Task AddDeviceAsync()
{
string deviceId = "myFirstdevice";
Device device;
try
{
device = await Registrymanager.AddDeviceAsync(new Device(deviceId));
}
catch (DeviceAlreadyExistsException)
{
device = await Registrymanager.GetDeviceAsync(deviceId);
}
Console.WriteLine("Generated device key: {0}", device.Authentication.SymmetricKey.PrimaryKey);
}
static void Main(string args[])
{
Registrymanager =RegistryManager.CreateFromConnectionString(connectionString);
AddDeviceAsync().Wait();
Console.ReadLine();
}
}
}

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