ASP.NET 1.0 and 1.1 BasicsASP.NET discussion for users new to coding in ASP.NET 1.0 or 1.1. NOT for the older "classic" ASP 3 or the newer ASP.NET 2.0.
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You actually can use the alert function within vbscript as well. Here is an example:
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<script language="vbscript">
Sub btnAdd_onclick()
If document.FormName.TextBoxName.value = "" Then
alert "The following fields must be entered to proceed:" & vbcrlf & "*Field that was blank."
End If
End Sub
</script>
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Of course this is the client side version. You will have to make a few changes/additions if you want to implement this in your code-behind file.