I'm converting a working unicode app dll from vc6 to vs2008, but I'm getting a compile error: '_L': identifier not found

example line of code:-

if(*strPrinter==_L(""))


The program already includes: #include <AtlConv.h>

I have tried adding #include <wchar.h> and <tchar.h> to no avail.

NOTE: this is working on VS6, so maybe it's a problem with project settings somewhere??? any ideas?

Thanks,
Hobnob