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How to check if a string contains strictly Letters and/or Numbers (ASP.NET)

Posted on 2004-08-24
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Last Modified: 2012-06-27
Hello all,

This should be a simple question.  I would like to do a boolean test to ensure that a string contains letters or numbers or both.  Incase that is not clear, it may not contain any other character other than a letter or number.  Is there such a function in ASP.NET?


Please advise,

-TH
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Question by:travishaberman
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LVL 19

Expert Comment

by:Desp
ID: 11889661
VB.Net or c#?
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Author Comment

by:travishaberman
ID: 11889680
You know something.. I know this sounds stupid - But I don't even know.. I am fairly decent with C++ and this is my first time ever writing anything in a language like this..  I am working in the ASP "WEB MATRIX" .. Does that help?
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Accepted Solution

by:
ozo earned 50 total points
ID: 11889686
If Not Regex.IsMatch( String, "[^A-Za-z0-9]" ) Then
   
End If
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Author Comment

by:travishaberman
ID: 11889695
Thank you much...!
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LVL 19

Expert Comment

by:Desp
ID: 11889734
its C# at the moment: you can convert it to vb.net

foreach (Char c in s.ToCharArray() )
      {
      if (!Char.IsLetter(c))
           break; // non letter charactar
      }
            
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