Secure code for admin page

Hiiiii Alll  Friend

In my website i am using membership class, Well everything is working fine, here i just need advice

when user SignIn and user is in role "Administrator" he can see the Admin named hyperlink, i have used this code for that:
if (Page.User.IsInRole("Administrator"))
{
HyperLink hp;
hp = (HyperLink)LoginView1.FindControl("AdminLink");

hp.Visible = true;
// I have set AdminLink Property visible=false;
}

Sooo friend here i just ...