LNK2001: unresolved external symbol _main

Hello,
I'm learning WinAPI and I can't run the code from tutorial. There is this link error:

Linking...
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/main.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

main.exe - 2 error(s), 0 warning(s)

the code is as follows

#include <windows.h>

#define _MainClassName TEXT("WinAPIMainClass")
#define _AppName TEXT("We learn WinAPI")

HINSTANCE g_hInstance;
HWND g_hwndMain;

LRESULT CALLBACK WindowProcMain(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
      switch ( message )
      {
            case WM_DESTROY:
                  PostQuitMessage(0);
                  break;
      }
      return DefWindowProc(hwnd, message, wParam, lParam);
}


BOOL InitApp()
{
      WNDCLASSEX wc;
      wc.cbSize = sizeof(WNDCLASSEX);
      wc.cbClsExtra = 0;
      wc.cbWndExtra = 0;
      wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
      wc.hCursor = LoadCursor(NULL, IDC_ARROW);
      wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
      wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
      wc.hInstance = g_hInstance;
      wc.lpfnWndProc = WindowProcMain;
      wc.lpszClassName = _MainClassName;
      wc.lpszMenuName = NULL;
      wc.style = CS_HREDRAW | CS_VREDRAW;
      if ( !RegisterClassEx(&wc) )
            return FALSE;

      g_hwndMain = CreateWindowEx(0, _MainClassName,
            _AppName,
            WS_OVERLAPPEDWINDOW | WS_VISIBLE,
            100, 100, 450, 350,
            NULL, NULL, g_hInstance, NULL);
      if ( g_hwndMain == NULL )
            return FALSE;
      return TRUE;
}

MSG msg;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInst, LPSTR lpCmdLine, int nShow)
{
      if ( !InitApp() )
            return FALSE;
      g_hInstance = hInstance;
      while ( GetMessage(&msg, NULL, 0, 0) )
      {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
      }
      return msg.wParam;
}

thanks for answer
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