New Post: get menu item on runtime using C#

Hi,
I am new in DNN and developing modules. I want to get on runtime the selected menu item and display the right form/user control(ascx) .

Say I have the following menu layout.
Menu1 Menu2
SubM11 SubM21
SubM12

Question: how can I detect that the user select Menu1 or SubM2 for example in codebehind using C#. Then I can display the right form/usercontrol (ascx)

I have searched but cannot find an answer.

Regards,

henk