<asp:Menu ID="Menu1"  runat="server" Orientation="Horizontal" 
                        BackColor="#FFCC66" ForeColor="#990000"
                        Font-Names="Verdana" Font-Size="0.8em" OnMenuItemClick="Menu1_MenuItemClick">
                <Items> 
                    <%-- <asp:MenuItem Text="К списку" Value="Back" />   --%>    
                    <asp:MenuItem Text="Основное" Value="main"  />  
                    <asp:MenuItem Text="Паспорт" Value="passport" />   
                </Items>
                  <StaticMenuItemStyle HorizontalPadding="15px" VerticalPadding="3px" />                 
                  <StaticSelectedStyle BackColor="White"  />                  
                  <StaticHoverStyle BackColor="#990000" ForeColor="White" />
              </asp:Menu>

<script runat="server">
    
    Public EmpId As String 'код текущего сотрудника
    
    Public Property CurEmpId() As String
        Get
            Return EmpId
        End Get
        Set(ByVal value As String)
            EmpId = value
        End Set
        
    End Property

    Protected Sub Menu1_MenuItemClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.MenuEventArgs)        
        
        If Menu1.SelectedValue = "passport" Then      
           Response.Redirect("passport.aspx" & "?ID=" & CurEmpId)  
        End If

        If Menu1.SelectedValue = "main" Then    
           Response.Redirect("EmpForm.aspx" & "?ID=" & CurEmpId)
        End If
    End Sub
</script>