Why is adding null to a string legal?

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From MSDN:

In string concatenation operations,
the C# compiler treats a null string
the same as an empty string, but it
does not convert the value of the
original null string.

More information on the + binary operator:

The binary + operator performs string
concatenation when one or both
operands are of type string.

If an
operand of string concatenation is
null, an empty string is substituted.
Otherwise, any non-string argument is
converted to its string representation
by invoking the virtual ToString
method inherited from type object.

If
ToString returns null, an empty string
is substituted.

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