Asp.net - Hide Web Link From Users Without Role Assigned?

I currently have some security working in my application by using the roles and rules, but i wondered whether it was possible to hide web links depending on if a user belongs to a certain role.I currently have it so users belong to either the 'admin' role or 'user' role. Rules have been setup on folders in my application so if a user belongs to either of the groups they can click on a web link and it takes them to the page. However, if a new user registers they belong to no role, and when they click on the web link it redirects them to the homepage (see code below). This is great, but, i wondered is it possible to hide that web link if the user did not belong to a specific role preventing them click on it. Also if a user belonged to no role could they be redirected to a page to tell them they need a role assigned?

<authentication mode="Forms">
<forms loginUrl="~/Homepage1.aspx" timeout="2880" />
</authentication>

I dont use this in the current application but have in the past, this checks if the user has been authenticated, i wondered whether i could use a similar IF statement for:If user.identity does not belong to 'user' or 'admin' role, then redirect them to page and display error?

If User.Identity.IsAuthenticated = True Then
Dim myUser As MembershipUser
Dim objUser As Object[code].....