Nullable decimal question

Hi all,
why doesn't this piece of simple code compile:

decimal target;
decimal value;
target = decimal.TryParse("9", out value) value : null;

Error    1
Type of conditional expression cannot be determined because there is no implicit conversion between 'decimal' and '<null>'

Whereas this works fine:

if (decimal.TryParse("9", out value))
    target = value;
else
    target = null;