Io ho lasciato stare le cose così, ossia ho imposto la virgola come separatore decimale.
Ma se volessi il punto farei così:
pagina aspx
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="a.aspx.vb" Inherits="prove_a" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:CompareValidator ID="CompareValidator1" runat="server" ErrorMessage="Inserire un numero inferiore a 15"
ControlToValidate="TextBox1" Operator="LessThan" Type="Double" ValueToCompare="15.0"></asp:CompareValidator>
<br />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
codice vb
Option Strict On
Imports l = libreria.ModuloWeb
Partial Class prove_a
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
ImpostaCulturaItalianaDecimalePunto()
End Sub
'---------------------------------------------------------------------------------
'imposta la cultura italiana col decimale punto per il Thread corrente
'---------------------------------------------------------------------------------
Public Sub ImpostaCulturaItalianaDecimalePunto()
Dim ci As New CultureInfo("it-IT")
ci.NumberFormat.NumberDecimalSeparator = "."
System.Threading.Thread.CurrentThread.CurrentCulture = ci
End Sub
End Class