Memory Leak from a loop inside thread.

private void StartRealTrading()
        {
            string CurrencyPair = String.Empty;
            SimulationData Simulate = new SimulationData();
            DataRow[] dRows;

            string PossessedCurrencyPair = string.Empty;
            bool IsPossessed = false;

            DataTable DtPossessed = new DataTable();

            int cnt = 0;

            try
            {
                while (true)
                {
                    if (cnt > 100)
                    {
                        GC.Collect();
                        cnt = 0;
                    }
                    cnt++;


                    if (!_Start)
                        break;

                    try
                    {
                        // This function check the information from Database      
                        if (!GetDBPossessedCurrency(ref PossessedCurrencyPair))
                            this.AddOrderInformation = true;

                        Thread.Sleep(500);

                        // This Function dequeues object from queue and stores it into datatable if the AddOrderInformation ==true.
                        DequeueOrderInformation();

                        //check if start date has crossed or not.
                        if (DateTime.Now < mUsrSetting.StartDate)
                            continue;

                        /*  check if end date has crossed or not.
                         * if end date is reached the stop the Auto Run
                        */
                        if (DateTime.Today > mUsrSetting.EndDate)
                            break;

                        //check if any currency pair exists for monitoring or not.
                        dRows = dtOrderInfo.Select("DoMonitoring = 1 ");  // 1= do monitoring ,, 0 = don't do monitoring
                        if (dRows == null || dRows.Length == 0)
                        {
                            continue;
                        }
                    }
                    catch (ThreadAbortException)
                    {
                        break;
                    }
                    catch (Exception ex)
                    {
                        this.mELog.WriteError("StartRealTrading1", ex, false);
                    }

                    //foreach (DataRow dRow in dtOrderInfo.Rows)
                    for(int i=0;i