Auto login??

Question

Hi,

I m new to VS.Net and C#. I have a project that auto logins authorized user.

  protected void Page_Load(object sender, EventArgs e)
    {
        string strName = Request.ServerVariables["AUTH_USER"];

But i would like to know where is the login aspx part for unauthorized user??? I searched the project but could NOT see anything about login page.

Any help would be great.

thanks in advance.