Limit the characters in a TextBox

Well, my question is very simple. Only one line code can do it.

TextBox.MaxLength = 10

But this only works when you are typing. Imagine the next case:

Dim s as string = "I.Need.Help.MSDN"
'16 characters'

TextBox.MaxLength = 10
TextBox.Text = s

'Final result in TextBox: I.Need.Help.MSDN that is higher than 10 characters'

So, what I want to do, is remove all characters up to my MaxLenght Value (10)

Is it possible?

(I´m using .Net Framework 3.5 in Visual Studio 2012)

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Meu novo programa (Bloco de Notas) http://hyrokumata-app.blogspot.pt/2012/07/notepad-3-beta.html