Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

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C#

webservice

Hi all, i wanna ask you about thread in webservice, i have two main threads that will handle some process.
Example : Thread A = > Handle process 1.
Thread B = > Handle process 2.

When the message come into my webservice, Thread A will process the message (this process is inserting data into database).
Simultanously, Thread B always check is exist data in database, if exist Thread B will read some messages in the database and processing it tobe a meaningful data. As your information, Thread B will never be die, may be like a "daemon" i think :-\ . So, when Thread A has finished its process, Thread B is always run eventhough the data in database is not exist. But unfortunately, while Thread B is still run, sudden an error has occured : "Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack".
I have tried to restart the iis but it doesn't work.. :~ It has made me like a stupid boy... arrrgghhh... :mad:

This is my code :

[WebMethod]
    public void MethodOAQ(byte[] messages, string memberCode)
    {
      CController cc = new CController(memberCode, messages, 6);
      BasicController bc = new BasicController();
      Thread oThread1 = new Thread(() => cc._SaveMsgToTbl_());
      Thread oThread2 = new Thread(() => bc._BackgroundWorker(null));

      oThread2.IsBackground = true;

      oThread1.Start();
      oThread2.Start();
    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Threading;
using System.ComponentModel;

/// <summary>
/// Summary description for CController
/// This class will control first task.
/// </summary>
public class CController
{
  CExecutorQuery ceq;
  private readonly string memberid = string.Empty;
  private readonly byte[] content = null;
  private readonly int type_msg;

  public CController(string memberid, byte[] content, int type_msg) 
  {
    this.memberid = memberid;
    this.content = content;
    this.type_msg = type_msg;
  }

  public int SaveMsgToTbl() 
  {
    ceq = new CExecutorQuery();
    int kondisi = 0;

    try
    {
      ceq.INSERT_DATA_T_INCOMING_MSGS(Encoding.UTF8.GetString(content), DateTime.Now.ToString("yyyyMMdd"), memberid, "NEW", type_msg);
      kondisi = 1;
    }
    catch 
    {
      kondisi = 0;
    }
    return kondisi;
  }

  public void _SaveMsgToTbl_() 
  {
    ceq = new CExecutorQuery();
    ceq.INSERT_DATA_T_INCOMING_MSGS(Encoding.UTF8.GetString(content), DateTime.Now.ToString("yyyyMMdd"), memberid, "NEW", type_msg);
  }
}

internal sealed class BasicController 
{
  private CReaderConfig crc;
  private ClassPesan cp;
  private CExecutorQuery ceq;

  public void _BackgroundWorker(object sender) 
  {
    if (IS_THREAD_ALIVE.Equals(false)) 
    {
      IS_THREAD_ALIVE = true;
      ThreadPool.QueueUserWorkItem(new WaitCallback(_Process), null);   
    }
  }

  private void _Process(object sender) 
  {
    crc = new CReaderConfig();
    ceq = new CExecutorQuery();
    IDictionary<string, IDictionary<int, string>> KAMUS = new Dictionary<string, IDictionary<int, string>>();

    while (true) 
    {
      System.Threading.Thread.Sleep(1000);
      foreach (string membercode in crc.List_Payment_Bank())
      {
        KAMUS.Add(membercode, ceq.COLLECT_DATA_T_INCOMING_MSG(membercode, "NEW"));
      }
      foreach (KeyValuePair<string, IDictionary<int, string>> dict in KAMUS) 
      {
        foreach (KeyValuePair<int, string> pair in dict.Value) 
        {
          try
          {
            cp = new ClassPesan(Encoding.UTF8.GetBytes(pair.Value), dict.Key);
            cp.PROCESS_DATA(); // While execute this method an error occured
            ceq.DO_UPDATE_DATA_T_INCOMING_MSGS(dict.Key, pair.Key);
          }
          catch (Exception ex)
          {
            continue;
          }
        }
      }
    }
  }

NB : I think this has nothing to do with the "Response.Redirect" because of this issue to talk about webservice.

Would you please help me ?? :confused: