codice:
<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        If Not Me.IsPostBack Then
            libreria.DataBind(Me.DataGrid1, StringaConnessioneTest, "select * from campi", "id")
        End If
    End Sub

    Protected Sub DataGrid1_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs)
        Me.Label2.Text = DirectCast(e.Item.FindControl("Label1"), Label).Text
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Pagina senza titolo</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DataGrid ID="DataGrid1" runat="server" AutoGenerateColumns="false" OnItemCommand="DataGrid1_ItemCommand">
            <Columns>
                <asp:TemplateColumn HeaderText="testo">
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%#Eval("testo") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateColumn>
                <asp:ButtonColumn ButtonType="LinkButton" Text="trova label"></asp:ButtonColumn>
            </Columns>
        </asp:DataGrid>
    </div>
        <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
    </form>
</body>
</html>