error LNK2019, LNK1120 : win32 API programing by vc++2005 beta2

i am beginer in c++.
i wanna learn win32api.
so, i tried below example using vc++2005 express beta2.
but i met following 2 errors :
Error 1 error LNK2019: unresolved external symbol _main
      referenced in function _mainCRTStartup MSVCRTD.lib
Error 2 fatal error LNK1120: 1 unresolved
       externals c:\test\parse\winapitest3\winapitest3
       \Debug\winapitest3.exe
//--------------------------------------------------------------

here, my example code:

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
LPSTR lpszClass="test";//"First";

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE
hPrevInstance ,LPSTR lpszCmdParam,int nCmdShow)
{
HWND hWnd;
MSG Message;
WNDCLASS WndClass;
g_hInst=hInstance;

WndClass.cbClsExtra=0;
WndClass.cbWndExtra=0;
WndClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
WndClass.hInstance=hInstance;
WndClass.lpfnWndProc=(WNDPROC)WndProc;
//WndClass.lpszClassName=(LPCWSTR)lpszClass;
WndClass.lpszClassName=lpszClass;
WndClass.lpszMenuName=NULL;
WndClass.style=CS_HREDRAW | CS_VREDRAW;
RegisterClass(&WndClass);

hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
    NULL,
    (HMENU)NULL,
    hInstance,
    NULL);
    //(LPCWSTR)NULL);
ShowWindow(hWnd,nCmdShow);

while(GetMessage(&Message,0,0,0)) {
  TranslateMessage(&Message);
  DispatchMessage(&Message);
}
return Message.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
switch(iMessage) {
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}
//----------------------------------------

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