How do I validate the value of a textbox from 0000 thru 9999 on the server side via VB.NET?

I need to validate if a textbox's value is between 0000 thru 9999 (with padded zeroes).  I have to implement it on the server side using VB.NET code.

How can I do this?
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TimCotteeHead of Software ServicesCommented:
Hello crickpaolo,

A regular expression of \d{4} will validate that easily, you can implement this as a regular expression validator client-side and then again server-side.


  Imports System.Text.RegularExpressions 
Public Dim regex As Regex = New Regex( _
      "\d{4}", _
    RegexOptions.IgnoreCase _
    Or RegexOptions.CultureInvariant _
    Or RegexOptions.IgnorePatternWhitespace _
    Or RegexOptions.Compiled _
Dim IsMatch As Boolean = regex.IsMatch(InputText)

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crickpaoloAuthor Commented:
thanks man.
Anurag ThakurTechnical ManagerCommented:
make sure that your text box takes maximum input of 4 characters that also only numbers and no special characters alphabets and space or a dot
i will suggest you to do the first level of test by using a regularexpression validator then only verify again at the server side - why do you want to do a round trip for this kind of verification which can be easily done on the client side by regularexpression validator and the expression will be whats defined by TimCottee in the previous comment
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