title: How to use Microsoft.Exchange.WebServices?
body: <p>i try to use : Microsoft.Exchange.WebServices.dll to use outlook. but connection return error</p>
  
  <p>Error return line:<b>service.AutodiscoverUrl("myusernamek@xxxx.com");</b> </p>
  
  <p><b>The Autodiscover service could not be located.</b> my codes: <br></p>
  
  <pre><code>
  using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Net.Mail;
  using System.Net;
  using Microsoft.Exchange.WebServices.Data;
  using Microsoft.Exchange.WebServices.Autodiscover;
  using System.Net.Security;
  using System.Security.Cryptography.X509Certificates;
  
  namespace test
  {
      class Program
      {
          static void Main(string[] args)
          {
              try
              {
                  // Connect to Exchange Web Services as user1 at contoso.com.
                  ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
                  service.Credentials = new WebCredentials("myusernamek@xxxx.com", "mypassword", "xxxx.com");
                  service.TraceEnabled = true;
                  service.AutodiscoverUrl("myusernamek@xxxx.com");
  
                  // Create the e-mail message, set its properties, and send it to user2@contoso.com, saving a copy to the Sent Items folder. 
                  EmailMessage message = new EmailMessage(service);
                  message.Subject = "Interesting";
                  message.Body = "The proposition has been considered.";
                  message.ToRecipients.Add("recipientname@xxxx.aero");
                  message.SendAndSaveCopy();
  
                  // Write confirmation message to console window.
                  Console.WriteLine("Message sent!");
                  Console.ReadLine();
              }
              catch (Exception ex)
              {
                  Console.WriteLine("Error: " + ex.Message);
                  Console.ReadLine();
              }
  
          }
      }
  }</code></pre>
  
  <p><img src="https://i.stack.imgur.com/ul780.png" alt="alt text"></p>