title: Validate login credentials using EWS Managed API
body: <p>Is there a way to validate login credentials provided by a user using EWS Managed API without sending an email. I am using AutodiscoverUrl method on an [ExchangeService] object but it takes too long? Any suggestion would be appreciate it. </p>
  
  <pre><code>        try
          {
              ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
              service.Credentials = new WebCredentials("xxxx@yyy.com", "password");
              service.AutodiscoverUrl("xxxx@yyy.com", RedirectionUrlValidationCallback);    
  
              Console.WriteLine("Credentials validated successfully");
              Console.ReadLine();
  
          }
  
          catch(Exception e)
          {
              Console.WriteLine(e.Message);
              Console.ReadLine();
          }
  </code></pre>