Mi ha sempre funzionato in questi giorni ma stamattina mi da quest'errore:

System.Data.OleDb.OleDbException: Per l'operazione è necessaria una query aggiornabile. in Microsoft.VisualBasic.CompilerServices.Symbols.Con tainer.InvokeMethod(Method TargetProcedure, Object[] Arguments, Boolean[] CopyBack, BindingFlags Flags) in Microsoft.VisualBasic.CompilerServices.NewLateBind ing.LateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack) in ASP.prova_aspx.InserisciDati(Object Source, EventArgs E) in c:\inetpub\wwwroot\prova.aspx:riga 37

Il codice è questo:
codice:
<%@ Page Language="VB" ContentType="text/html" ResponseEncoding="utf-8" debug="true"%>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.Oledb" %>
<script runat="server">
	 Sub Page_Load(Source as Object, E as EventArgs)
	 End Sub

    Private ReadOnly Property StringaConnessione() As String
        Get
            Return "Provider=Microsoft.Jet.OLEDB.4.0;"& "Data Source=" & Server.MapPath("~/App_Data/collana.mdb")&""
        End Get
    End Property
    


 	 Sub InserisciDati(Source as Object, E as EventArgs)

	    Dim cn
        Dim str
        Dim cmd

		Dim icount As Integer
 	    cn = New  OleDbConnection(StringaConnessione)

        Dim titolo = Request.Form("TextBox1")
        Dim descrizione = Request.Form("TextBox2")

        Try
            cn.Open()
            str = "INSERT INTO libri (titolo,descrizione) Values ('" & TextBox1.text & "', '" & TextBox2.text & "')"

			

			cmd = New OleDbCommand(str, cn)
		

			icount = cmd.ExecuteNonQuery()
'       	Response.Write(str)

Catch ex As Exception
'messaggio di errore
response.write(ex.tostring())
Finally
'chiusura connessione
Dim connessione
If (Not (Connessione Is Nothing)) Then Connessione.Close()
End Try

        Label1.Text = "Database now updated"
     End Sub
</script>
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Inserimento dati</title>
</head>
<body>
<div id="div1"  >
<form action="registrazione.aspx" method="post" name="collana" id="collana" runat="server">
  <table width="731" border="0" align="center">
    <tr>
      <td colspan="4" align="center" valign="middle">Iserimento dati</td>
    </tr>
    <tr>
      <td width="168" align="center" valign="middle">Titolo</td>
      <td colspan="3" align="left" valign="middle"><asp:TextBox ID="TextBox1" TextMode="SingleLine" runat="server" /><asp:RequiredFieldValidator ControlToValidate="TextBox1" ID="txtTextBox1" runat="server" Text="*Richesto" />
</td>
    </tr>
    <tr>
      <td align="center" valign="middle">Descrizione</td>
     <td colspan="3" align="left" valign="middle"><asp:TextBox ID="TextBox2" TextMode="SingleLine" runat="server" /><asp:RequiredFieldValidator ControlToValidate="TextBox2" ID="txtTextBox2" runat="server" Text="*Richesto" />
</td>
</tr>

    <tr>
      <td align="center" valign="middle">Inserisci</td>
      <td colspan="3" align="left" valign="middle"><asp:Button ID="Button1" Text="Invia" runat="server" onClick="InserisciDati"/></td>
    </tr>
  </table>
</form>
<div id="div2" align="center"></div>
<asp:Label ID="label1" runat="server"></asp:Label>
</body>
</html>
Non riesco a capire il perchè il permesso di lettura e scrittura sul db è settato a everyone...
Mi date una mano per piacere?