Changing the menu item list based on the role

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C#

Hi everyone,
I'm working on a project where I have 2 roles say admin, merchant. Different Menu Items are displayed for different role users.

Admin should have menu items like home, aboutus, reports, merchantmanagement, productmanagment.

Merchant should have only home, aboutus, reports, productmanagment.

Please help me to solve this.
May I know can we achieve it with out using sitemap concept.

any kind of help will be appreciated.

Thanks,
Rohith.