TripleDES output size

Hello to all,

I'm new to cryptography and I've to implement encryption of data into
a database.
I'm using .NET framework TripleDESCryptoServiceProvider to crypt and
decrypt strings.
Anyway I can not find any reference on how to calculate the length of
the encrypted string based on the length of the plain string.
As I've to store the encrypted data into table fields, I've to be sure
it fits into the field size.

Does anybody knows how to do this?

Thanks.
(I'm posting this also to microsoft.public.security.crypto)
.

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