CRM 2016 - Microsoft.Xrm.Client.CrmConnection

string connectionStr = @"Url=https://xxx.crm4.dynamics.com; Username=xxx-crm@xxx.com;Password=xxxx;";
            Microsoft.Xrm.Client.CrmConnection connection = CrmConnection.Parse(connectionStr);
            Console.WriteLine("Connecting...");

            // Obtain an organization service proxy.
            // The using statement assures that the service proxy will be properly disposed.
            using (var _orgService = new OrganizationService(connection))
            {
                WhoAmIResponse resp = (WhoAmIResponse)_orgService.Execute(new WhoAmIRequest());
                Console.WriteLine("UserId : " + resp.UserId.ToString());
                Console.Write("OK!!");
                Console.ReadKey();
            }