Check Value passed in the QueryString is Numeric

The code below simply checks that the ID value passed in the Querystring isn't empty and is numeric. We use the Len function and IsNumeric VBscript functions to do this.

<%
If Len(Request.Querystring("ID"))>0 AND IsNumeric(Request.Querystring("ID")) Then
'execute your code
End If
%>

You may think that using the LEN function isn't necessary but indeed it is. I ran a test and found that If ID is left out of the querystring and there is no value passed as in the URL below, isNumeric(request.querystring(ID)) would indeed return TRUE.

www.codefixer.com/index.asp

It's best therefore to do the double check that the querystring isn't empty and also that it's value is numeric.

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