private static async Task GetAccountsAsync()
        {
            try
            {
                S2SAuthenticationwithD365 s        = new S2SAuthenticationwithD365();
                string[]         accountProperties = { "name" };
                JObject          collection;
                ClientCredential credential = new ClientCredential("provide client Id", "provide secret key");

                string     authorityUri = "https://login.microsoftonline.com/abc.onmicrosoft.com/oauth2/authorize"; // here abc.onmicrosoft.com is my crm domain. Please replace with your domain
                TokenCache tokenCache   = new TokenCache();

                AuthenticationContext context = new AuthenticationContext(authorityUri);
                AuthenticationResult  result  = await context.AcquireTokenAsync("Provide crm credential", credential);

                var authToken  = result.AccessToken;
                var httpClient = new HttpClient();
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authToken);
                ServicePointManager.SecurityProtocol           = SecurityProtocolType.Tls12; //
                var response    = httpClient.GetAsync("crmurl/api/data/v9.0/accounts?$select=name").Result;
                var accountJSON = await response.Content.ReadAsStringAsync();

                collection = JsonConvert.DeserializeObject <JObject>(response.Content.ReadAsStringAsync().Result);
                s.DisplayFormattedEntities("Saved query (Active Accounts):", collection, accountProperties);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception ex is" + ex.Message);
            }
        }
        public static void Main(string[] args)
        {
            S2SAuthenticationwithD365 s = new S2SAuthenticationwithD365();

            try
            {
                GetAccountsAsync().Wait();
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine("There was an exception:" + ex.ToString());
            }
        }