Dim connectionConfiguration As Configuration = Web.Configuration.WebConfigurationManager.OpenWebConfiguration("~")
        connectionConfiguration.ConnectionStrings.ConnectionStrings("STR_CONN_OLD").Name = "STR_CONN_MODIICATA"
        connectionConfiguration.ConnectionStrings.ConnectionStrings("STR_CONN_MODIICATA").ConnectionString = "una nuova connection string....."
        connectionConfiguration.Save(ConfigurationSaveMode.Modified)
        ConfigurationManager.RefreshSection("connectionStrings")