Public Class MainMaster
    Inherits System.Web.UI.MasterPage

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Protected Sub ASPxNavBar1_ItemClick(source As Object, e As DevExpress.Web.NavBarItemEventArgs) Handles ASPxNavBar1.ItemClick

        Response.Redirect(e.Item.Text)

        If e.Item.Text = "Codici Iva" Then
            Response.Redirect("CodiciIva.aspx")       '<-- chiama la pagina ---
        ElseIf e.Item.Text = "Zone" Then
            Response.Redirect("Zone.aspx")       '<-- chiama la pagina ---
        End If

    End Sub
End Class