Unreaded mail can't be get in NemailEx event in outlook c#

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C#

Outlook

1. i want delete attachment when new mail receiving.....
2. so i use NewmailEx event.....and also tried Newmail event.....
3. i open the outlook --> send a mail to my outlook mail -->the event get fired -->but the received mail is not shown in my unreaded mail i.e, c# coding did't get the received mail (this happen only for the first mail..after closing and opening of outlook..from the second mail the operation works correctly)
4. i attach my code below

private void ThisAddIn_Startup(object sender, System.EventArgs e)
       {
           this.Application.NewMail += new Microsoft.Office.Interop.Outlook
              .ApplicationEvents_11_NewMailEventHandler(ThisApplication_NewMail);
       }
       private void ThisApplication_NewMail()
       {
           Outlook.MAPIFolder inBox = this.Application.ActiveExplorer()
               .Session.GetDefaultFolder(Outlook
               .OlDefaultFolders.olFolderInbox);
           Outlook.Items inBoxItems = inBox.Items;
           Outlook.MailItem newEmail = null;
           inBoxItems = inBoxItems.Restrict("[Unread] = true");

           foreach (object collectionItem in inBoxItems)
           {
               newEmail = collectionItem as Outlook.MailItem;
               if (newEmail != null)
               {
                   if (newEmail.Attachments.Count > 0)
                   {
                       for (int i = 1; i <= newEmail
                          .Attachments.Count; i++)
                       {
                           newEmail.Attachments[1].Delete();

                       }
                   }
               }
           }
       }

5. pls help me to read he first mail.....when outlook was open...
6. thank u in advance