C #-Check email existance in Outlook

// --------------------------------------------------------------------------------------------------------------------// 
 
  //   Respect the work.// 
 // //   Defines the EmailChecker type.// // --------------------------------------------------------------------------------------------------------------------namespace CSharpLearning{    using System;    using System.Linq;    using Microsoft.Exchange.WebServices.Data;    ///     /// The email checker class.    ///     internal class EmailChecker    {        ///         /// Check emails with the specified subject. Return the first mail item if found; null if not found.        ///         ///         /// The email address.        ///         ///         /// The email subject.        ///         /// 
 
          /// The 
  .        /// 
         public static MailItem Check(string emailAddress, string emailSubject)        {            var exchangeService = new ExchangeService(ExchangeVersion.Exchange2010);            exchangeService.AutodiscoverUrl(emailAddress);            var findItemsResults = exchangeService.FindItems(WellKnownFolderName.Inbox, new ItemView(128));            var itemResponses = exchangeService.BindToItems(                    findItemsResults.Select(item => item.Id),                    new PropertySet(                        BasePropertySet.FirstClassProperties,                        EmailMessageSchema.From,                        EmailMessageSchema.ToRecipients,                        EmailMessageSchema.CcRecipients));            return itemResponses.Select(item => new MailItem            {                Time = item.Item.DateTimeReceived,                From = ((EmailAddress)item.Item[EmailMessageSchema.From]).Address,                Subject = item.Item.Subject,                To = ((EmailAddressCollection)item.Item[EmailMessageSchema.ToRecipients]).Select(recipient => recipient.Address).ToArray(),                CC = ((EmailAddressCollection)item.Item[EmailMessageSchema.CcRecipients]).Select(recipient => recipient.Address).ToArray(),                Body = item.Item.Body.ToString()            }).ToArray().FirstOrDefault(item => item.Subject == emailSubject);        }        ///         /// The mail item class.        ///         internal class MailItem        {            ///             /// Gets or sets the mail received time.            ///             public DateTime Time { get; set; }            ///             /// Gets or sets the mail from.            ///             public string From { get; set; }            ///             /// Gets or sets the mail subject.            ///             public string Subject { get; set; }            ///             /// Gets or sets the mail to.            ///             public string[] To { get; set; }            ///             /// Gets or sets the mail cc.            ///             public string[] CC { get; set; }            ///             /// Gets or sets the mail body.            ///             public string Body { get; set; }        }    }}