C / C++ / MFC

// Disconnect connection
void CDatabase::Close()
{
	ASSERT_VALID(this);

	// Close any open recordsets
	AfxLockGlobals(CRIT_ODBC);
	TRY
	{
		while (!m_listRecordsets.IsEmpty())
		{
			CRecordset* pSet = (CRecordset*)m_listRecordsets.GetHead();
			pSet->Close();  // will implicitly remove from list
			pSet->m_pDatabase = NULL;
		}
	}
	CATCH_ALL(e)
	{
		AfxUnlockGlobals(CRIT_ODBC);
		THROW_LAST();
	}
	END_CATCH_ALL
	AfxUnlockGlobals(CRIT_ODBC);

	if (m_hdbc != SQL_NULL_HDBC)
	{
		RETCODE nRetCode;
		AFX_SQL_SYNC(::SQLDisconnect(m_hdbc)); // here is error???
		AFX_SQL_SYNC(::SQLFreeConnect(m_hdbc));
		m_hdbc = SQL_NULL_HDBC;

		_AFX_DB_STATE* pDbState = _afxDbState;

		AfxLockGlobals(CRIT_ODBC);
		ASSERT(pDbState->m_nAllocatedConnections != 0);
		pDbState->m_nAllocatedConnections--;
		AfxUnlockGlobals(CRIT_ODBC);
	}
}

// in my funktion:
dlgProgress.ShowWindow(SW_SHOW);
dlgProgress.SetForegroundWindow();
EnableWindow(FALSE); // for main dialog
// after funktion:
EnableWindow(TRUE); // for main dialog