How to restrict manually done unread mail from outlook

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C#

ASP.NET

Hi friends,
I have done coding to save attachment from outlook those are unread mail.

please find the below coding .It is working fine.

string sp = @"D:\filescompare"; //Input directory to process comparision
//            ---Download attchment from outlook unread mail----
//Start
Microsoft.Office.Interop.Outlook.Application myApp = new Microsoft.Office.Interop.Outlook.ApplicationClass();
Microsoft.Office.Interop.Outlook.NameSpace mapiNameSpace = myApp.GetNamespace("MAPI");
Microsoft.Office.Interop.Outlook.MAPIFolder myInbox = mapiNameSpace.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderInbox);
Microsoft.Office.Interop.Outlook.MailItem newEmail = null;

try
{
    foreach (object collectionItem in myInbox.Items.Restrict("[unread]=true"))
    //foreach (object collectionItem in myInbox.Items.Restrict("[unread]=true"))
    {
        newEmail = collectionItem as Microsoft.Office.Interop.Outlook.MailItem;
        //newEmail = collectionItem as Microsoft.Office.Interop.Outlook.MailItem;

        if (newEmail != null)
        {
            if (newEmail.Attachments.Count > 0)
            {
                for (int j = 1; j <= newEmail.Attachments.Count; j++)
                {
                    newEmail.Attachments[j].SaveAsFile(sp + "\\" + newEmail.Attachments[j].FileName);
                }
            }
            else
            {
                Console.WriteLine();
            }
        }
    }
}
catch (System.Runtime.InteropServices.COMException ex)
{
    Console.WriteLine(ex.ToString());
}

But i want restrict if some body manually done unread ,for read mails.

Regards
Arul.R