Creating a Server with current nuget packages?

How about this:

using Azure.Identity;
using Azure.ResourceManager;
using Azure.ResourceManager.Resources;
using Azure.ResourceManager.Sql;
using Azure.ResourceManager.Sql.Models;

async Task CreateSqlServerAsync()
{
    string subscriptionId = "<your-subscription-id>";
    string resourceGroupName = "<your-resource-group>";
    string location = "eastus";
    string serverName = "<your-server-name>";
    string adminLogin = "sqladmin";
    string adminPassword = "<your-password>";

    // Authenticate
    var credential = new DefaultAzureCredential();
    var armClient = new ArmClient(credential, subscriptionId);

    // Get the resource group
    ResourceGroupResource resourceGroup = await armClient.GetDefaultSubscriptionAsync()
        .Result.GetResourceGroups().GetAsync(resourceGroupName);

    // Define server data
    var serverData = new SqlServerData(location)
    {
        AdministratorLogin = adminLogin,
        AdministratorLoginPassword = adminPassword
    };

    // Create the SQL Server
    var sqlServerLro = await resourceGroup.GetSqlServers().CreateOrUpdateAsync(
        WaitUntil.Completed,
        serverName,
        serverData);

    SqlServerResource sqlServer = sqlServerLro.Value;
    Console.WriteLine($"SQL Server created: {sqlServer.Data.Name}");
}