No roundup or rounddown

I have a textfiled named textfield1.text......and the maximum number lenght is 12...

the problem is...if a user enter 12.678 for example then i need the field to accept 12.67..without any roundup or rounddown...

example : 45.789 must be 45.78 only,
               79.435434543 must be only 79.43

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Fernando SotoRetiredCommented:
Hi inzhagi;

This code will do what you want with the use of Regular Expression.

Imports System.Text.RegularExpressions

        Dim newValue As String
        Dim m As Match

        m = Regex.Match(TextField1.Text, "\d+\.\d{1,2}")
        'New Value holds the value you want
        newValue = m.Value()

Fernando SotoRetiredCommented:
Hi inzhagi;

One small change to my above code. I had changed the pattern so that the return string would be 123 for input 123, 123.4 for 123.4, 123.45 for 123.45 and 123.45 for values as 123.4567890.

    m = Regex.Match(TextField1.Text, "\d+(?:\.\d{1,2}){0,1}")


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If you want to do it on the number, not on the string then do something like this:
          Dim m As Double = 79.435434543
          Dim n As Double = (Fix(m * 100.0)) / 100.0
          ' n will hold 79.43 with no rounding
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