Dynamically generation Of Header Menu of Master page

protected void Page_Load(object sender, EventArgs e)
      {

          ArrayList al = new ArrayList();
          string[] aa = new string[] { "Abc", "Bfd", "Csd", "Has", "Pcd", "cdd", "Rep" };
          switch (Session["Username"].ToString())
          {
              case "Admin":
                  LinkButton link1 = new LinkButton();
                  link1.Text = aa[0];
                  LinkButton link2 = new LinkButton();
                  link2.Text = aa[1];
                  LinkButton link3 = new LinkButton();
                  link3.Text = aa[2];
                   LinkButton link4 = new LinkButton();
                  link4.Text = aa[3];
                   LinkButton link5 = new LinkButton();
                  link5.Text = aa[4];
                   LinkButton link6 = new LinkButton();
                  link6.Text = aa[5];
                   LinkButton link7 = new LinkButton();
                  link7.Text = aa[6];
                  break;

              case"User":
                   LinkButton link8 = new LinkButton();
                  link8.Text = aa[0];
                  LinkButton link9 = new LinkButton();
                  link9.Text = aa[1];
                  LinkButton link10 = new LinkButton();
                  link10.Text = aa[2];
                   LinkButton link11 = new LinkButton();
                  link11.Text = aa[3];
                   LinkButton link12 = new LinkButton();
                  link12.Text = aa[4];
                  break;

              case"ReadOnly":
                  LinkButton link13 = new LinkButton();
                  link13.Text = aa[0];
                  break;

          }
          foreach (LinkButton s in al)
          {
              headerMenuTab.Controls.Add(s);
          }