ZwTerminateProcess

[Teerayoot]

*From "Window Nt Native API Reference"

ZwTerminateProcess terminates a process and the threads that it contains.
NTSYSAPI
NTSTATUS
NTAPI
ZwTerminateProcess(
IN HANDLE ProcessHandle OPTIONAL,
IN NTSTATUS ExitStatus
);

////////////////////////////////////////////////////////

I try to using this function but the process do not terminate ,here is my code snippet

//// Global ////

#define NTSTATUS ULONG
typedef
NTSYSAPI
NTSTATUS
NTAPI
(*ZwTerminateProcess)(
IN HANDLE ProcessHandle OPTIONAL,
IN NTSTATUS ExitStatus
);
ZwTerminateProcess fZwTerminateProcess;

//// Use ////

fZwTerminateProcess = (ZwTerminateProcess)GetProcAddress(GetModuleHandleA("ntdll.dll"),"ZwTerminateProcess");
fZwTerminateProcess(NULL,1);

All compiling made sucessfull ,but when the process do not terminate.
Do i make somethings wrong?