Form Authentication with frameset

Hi,


I am facing a weird problem.
I am doing form authentication and after login I am redirecting control to RedirectButtons.aspx which has the frameset code.
web.config code:
<authentication mode = "Forms">
      <forms defaultUrl="RedirectButtons.aspx" loginUrl = "Login.aspx" slidingExpiration = "true" timeout = "20" >
        </forms>
    </authentication>
    <authorization>
       <deny users = "*" />
    </authorization>


login.aspx.cs:
at page load event:

Server.Execute("RedirectButtons.aspx");


RedirectButtons.aspx.cs:
at page load:

Response.Write("<frameset rows = '14%,*'>" ...