Thanks for the reply.
In this case I would suggest using roles in your web site in order to set the tabs visibility based on the current user role. The code snippet below shows how to hide the RadTabStrip tabs if the user is not in the "Admin" role.
sender, EventArgs e)
i = 0; i < RadTabStrip1.Tabs.Count; i++)
Please find more information about Managing Web Site Users with Roles in this help article