how to link thread from other cpp

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MFC

Hi and good morning to all the user of code project,
i try to link my thread from other cpp file to the main cpp, but it show an error message, as show as below,

>AutoModeDlg.obj : error LNK2019: unresolved external symbol "unsigned int __cdecl MyThreadA(void *)" (?MyThreadA@@YAIPAX@Z) referenced in function "public: void __thiscall CAutoModeDlg::OnBnClickedButton3(void)" (?OnBnClickedButton3@CAutoModeDlg@@QAEXXZ)
1>AutoModeDlg.obj : error LNK2019: unresolved external symbol "unsigned int __cdecl MyThreadB(void *)" (?MyThreadB@@YAIPAX@Z) referenced in function "public: void __thiscall CAutoModeDlg::OnBnClickedButton4(void)" (?OnBnClickedButton4@CAutoModeDlg@@QAEXXZ)
1>C:\Users\Noldx\documents\visual studio 2010\Projects\2NDTASK\Debug\2NDTASK.exe : fatal error LNK1120: 2 unresolved externals

here is the part of the sample code

in my secondary .cpp file
2ndary.h

static UINT MyThreadA(LPVOID pParam);
int a();

2ndary .cpp

int C2ndary::a()
{
//command of thread
return 0;
}

main cpp's header

CWinThread* thread1;

main cpp

#include "2ndary.h"

extern UINT MyThreadA(LPVOID pParam);//call back the static UINT MyThreadA(LPVOID //pParam) that i declared in the 2ndary.h


// bla bla bla

UINT C2ndary::MyThreadA(LPVOID pParam)
{
C2ndary* dialog;
dialog=(C2ndary*)pParam;
dialog->a();
return 1;
}

void CMaindlg::OnClickedButton1()
{
thread1=AfxBeginThread(MyThreadA,this);
}

thanks,

rgds

illm1995