ASP/VBScript IsNumeric()

<%
IsNumeric(expression)
%>

<% 
Option Explicit 
Dim strVar1,strVar2,strVar3,strVar4
strVar1 = ""
strVar2 = "ThaiCreate.Com"
strVar3 = "1234"
strVar4 = null
Response.write IsNumeric(strVar1)&"<br>"
Response.write IsNumeric(strVar2)&"<br>"
Response.write IsNumeric(strVar3)&"<br>"
Response.write IsNumeric(strVar4)&"<br>"
%>