mapping to a varchar

I have a parameter in a stored proc of type varchar. I create a sqlparameter to map to the varchar parameter. When do I have to specify the size of the parameter?
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' assume cmd is a SqlCommand object.
Dim p As New SqlParameter("@Parameter", SqlDbType.VarChar, 16)

You can specify the length as the third parameter, in my example I used 16.
You shouldn't...just use something like:

oComm.Parameters.Add(New SqlParameter("@varAdjustment", SqlDbType.varchar)).Value = "Blah"
philjhAuthor Commented:
Thanks for the response. I can see that I can use the length, yet natloz suggests that I shouldn't. Why? I am trying to understand if there is a rule about when I should and when I shouldn't.
As far as I have seen the length has not made a difference in my applications. It more than likely just uses a smaller amount of memory when you leave it wide most programs do.

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philjhAuthor Commented:
Sorry for the delay. Got sidetracked...
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