createthread MFC dialog based app (Syntax) - c++

Question

I am trying to create a Worker thread but I have not done Visual C++ since 2004 and threading syntax has changed (Please don't worry about timing issues, I will have that covered). the issue is that in an MFC dialog app, every way I know of trying to create a thread won't get past the compiler. I also have tried the "&" trick. It can't seem to find this function at all. Can anyone help please? NOTE: I tried three methods and I left the first uncommented.
if (i_found >= 0) { //this is just a combobox snippet to show the calls
MessageBox(wch.GetBuffer(0), L"Port Select", MB_OK);
_serialPort->Close();
ConversationRight = gcnew Conversation(systrName);
_beginthread(&CDLP_Printer_ControlDlg::Mine_QL, 0, 0); //NONE WORKING!!
//unsigned long lpRecvThread = _beginthreadex(NULL, 0, Mine_QL, (void*)this, NULL, NULL);
//unsigned long lpThreadIdRequest;
//::CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)Mine_QL, (void*)NULL, 0, &lpThreadIdRequest);
}
else
MessageBox(L"Not the left board", L"Port Select", MB_OK);
_serialPort->Close();
}
void CDLP_Printer_ControlDlg::OnBnClickedBtnStop()
{
ConversationRight->WriteLn("5");
}
bool CDLP_Printer_ControlDlg::UpdateCommsWindow_left(String^ strCommsLine)
{
return false;
}
void CDLP_Printer_ControlDlg::Mine_QL()
{
//_endthread();
}