Startup.cs

Startup.cs

//Other using import statements
//We only import 2 packages
using Azure.Security.KeyVault.Secrets;
using Azure.Identity;

//Other codes remain unchanged

//Only changes to be made are in this method ConfigureServices()
public void ConfigureServices(IServiceCollection services)
{
    var vaultName = "MyStageAzureSecretVault";
    var keyVaultUrl = $"https://{vaultName}.vault.azure.net";
    var client = new SecretClient(vaultUri: new Uri(keyVaultUrl), credential: new DefaultAzureCredential());

    var secretsDict = new string [] {"DatabaseUserId", "DatabasePassword"}
        .Select(async name => await client.GetSecretAsync(name))
        .Select(task => task.Result.Value)
        .ToDictionary(secret => secret.Name, secret => secret.Value);

    //Optinally write to console to confirm 
    foreach(var name in new string [] {"DatabaseUserId", "DatabasePassword"})
    {
        Console.Out.WriteLine($"{name}: {secretsDict[name]}");
    }

    //...
}