C++ and assembly

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I write this litle prog. with Visual C++ 6.0
Introductory Edition.
void main()
{
__asm
{
mov ah,0x02
mov dl,0x42;// B
int 0x21
mov ah,0x4c
int 0x21
}
}
I think that should do this
print B and close the prog.
It compile, it link, 0 error and 0 warning.
when I execute, a blue screen appear saying that the
prog do something wrong,
WHY.
THANKS.