I have a question with repeat open and close table

hello,everybody:

  I write one thread with use Vc6 IDE and I need repeat read data from table
,

  but it had throw error message when my application is runing.

  Error message is:

    This application has requested the Runtime to terminate it in an unusual
way.
    please contact the application's support team for mor information

  My segment of code fellow:

/*
  return false if empty data
*/
bool CReadData::OpenTable()
{
   ASSERT(m_pConn != NULL); //ado connection
   ASSERT(m_pTable_SMO != NULL); // table
 try
 {
     if (m_pTable_SMO->GetState() & adStateOpen)
       m_pTable_SMO->Close(); //close my table

    m_pTable_SMO->Open("select * from t_sminorder", //open my table
        m_pConn.GetInterfacePtr(),
        adOpenDynamic,
        adLockOptimistic,
        adCmdText);

  bool Empty = (bool)m_pTable_SMO->ADOEOF;
  if (!Empty)
     m_pTable_SMO->MoveFirst();
   return !Empty;
 }
 catch(_com_error *e)
 {
     return false?
  }
}

I need repeat read data from table in my thread code,

/*
  it process repeat data in my thread
*/
 DWORD WINAPI CReadData::Read_MO(void* lpParam)
{
 ...
 while(1)
 {

   if( pRd->OpenTable() == false) //read data from table
     continue;
   ....
   ....
  }
}

It wouldn't any exception when I add one sentence with Sleep(1000) ,
Why don't rapid read data?

I write other code in CBuilder,write simple code with repeat open and close
table, fellow

fastcall void TForm1::Button1Click(TSender : Sender)
{
   while(1)
   {
     adoTable1.close();
     adoTable1.open();
   }
}
  it is good for rapid read data from table, it explain the ADO support to
rapid open and close operate,
 but why don't rapid close and open in VC6?

 Please master-hand give me directions....