The name does not exist in the current context

Question

Hi team

 

Can anyone help with this logic error, "the name kvClient does not exist in the current context". Here is my code below. 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.IO;
using System.Threading.Tasks;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using Microsoft.Azure;
using Microsoft.Azure.KeyVault;
using Microsoft.Azure.Storage;
using Microsoft.Azure.Storage.Auth;
using Microsoft.Azure.Storage.Blob.Protocol;
using Microsoft.Azure.Storage.Blob;
using System.Threading;
using Microsoft.Azure.Management.ResourceManager.Fluent.Authentication;
using Microsoft.Azure.Management.ResourceManager.Fluent;
namespace EncryptionApplication
{
class Program
{
static void Main(string[] args)
{
Program p = new Program();
string secretName = "MySecret10";
string kvURL = "https://entsavmvault.vault.azure.net/";
//
string clientId = Environment.GetEnvironmentVariable("akvClientId");
string clientSecret = Environment.GetEnvironmentVariable("akvClientSecret");
string tenantId = Environment.GetEnvironmentVariable("akvTenantId");
string subscription = Environment.GetEnvironmentVariable("akvSubscription");
AzureCredentials credentials = SdkContext.AzureCredentialsFactory.FromServicePrincipal(clientId, clientSecret, tenantId, AzureEnvironment.AzureGlobalCloud).WithDefaultSubscription(subscription);
KeyVaultClient keyVaultClient = new KeyVaultClient(async (authority, resource, scope) => {
var adCredential = new ClientCredential(clientId, clientSecret);
var authenticationContext = new AuthenticationContext(authority, null);
return (await authenticationContext.AcquireTokenAsync(resource,adCredential)).AccessToken;
Console.WriteLine("Input the value of your secret");
string secretValue = Console.ReadLine();
Console.WriteLine("Your secret is '" + secretValue + "'.");
Console.WriteLine("Saving the value of your secret to your key vault");
var result = p.SetSecret(kvClient, kvURL, secretName, secretValue);
System.Threading.Thread.Sleep(5000);
Console.WriteLine("done");
Console.WriteLine("Forgetting your secret");
secretValue = "";
Console.WriteLine("Your secret is ''" + secretValue);
Console.WriteLine("Retrieving your secret from key vault");
var fetchedSecret = p.GetSecret(kvClient,kvURL,secretName,secretValue);
secretValue = fetchedSecret.Result;
Console.WriteLine("Your secret is" + secretValue);
});
}
public async Task GetSecret(KeyVaultClient kvClient, string kvURL, string secretName)
{
var keyvaultSecret = await kvClient.GetSecretAsync($"{kvURL}/secrets/{secretName}").ConfigureAwait(false);
return keyvaultSecret.Value;
}
public async Task SetSecret(KeyVaultClient kvClient, string kvURL, string secretName, string secretValue)
{
await kvClient.SetSecretAsync($"{kvURL}", secretName, secretValue);
return true;
}
}
}

What am i missing?