C#: Threads conflict in some cases, in loop conditions

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Im working in a thread project. in some cases I have these problems :

Here is some piece of my code :

List<EmailAddress> lstEmailAddress = new List<EmailAddress>();
private void TimerCheckInternetConnection_Tick(object sender, EventArgs e)
{
    lock (TicketLock)
    {
        if (UtilityManager.CheckForInternetConnection())
        {
            if (ApplicationRunStatus == Enum_ApplicationRunStatus.UnknownDisconnect || ApplicationRunStatus == Enum_ApplicationRunStatus.IsReady)
            {
                // Connect
                ThreadPool.QueueUserWorkItem((o) =>
                {
                    for (int i = 0; i < lstEmailAddress.Count; i++)
                    {
                        lstEmailAddress[i].IsActive = lstEmailAddress[i].Login();
                    }

                    this.BeginInvoke(new Action(() =>
                    {
                        // some code

                    }));
                });
            }
        }
    }
}

and this is EmailAddress class :

class EmailAddress
        {
            private Imap4Client imap = new Imap4Client();
            private object objectLock = new object();

            public bool IsActive;
            public string Address;
            public string Password;

            public string RecieveServerAddress;
            public int RecieveServerPort;

            public bool Login()
            {
                lock (objectLock)
                {
                    try
                    {
                        imap.ConnectSsl(RecieveServerAddress, RecieveServerPort);
                    }
                    catch (Exception)
                    {
                    }

                    try
                    {
                        imap.Login(Address, Password);
                        return true;
                    }
                    catch (Exception)
                    {
                        return false;
                    }
                }

            }
        }

and my problem is this:

when I want to use Login procedure that belongs to EmailAddress Class, It has some conflict. As you can see, I used Lock bud any thing changed.

for more details.. if I have 3 items in lstEmailAddress , the Login procedure has to called 3 times by this code. but every time, the login procedure will work on same username and password. so all my emails could not login correctly. if I remove threadpool, it will be ok.

thanks for any helping...

asked 14 secs ago

Elahe

463

C#: Threads conflict in some cases, in loop conditions