Question : opposite of IsNull

Hi: What is the opposite of IsNull I try IsNotNull but it gives syntax error

If tk <> "" And IsNotNull(rs!PPVVOD_End) Then
 ....
end if

Thanks.

Answer : opposite of IsNull

I seem to have misplaced the first "I" in both of my posts.  They should read:
>If tk <> ""  .....