Automatically log user in after they have verified.

Hi i am NOT using the membership controls, therefore i wanted to find out how after a user has clicked on the verification email they can be automatically logged into the system. This is what my log in page looks like, just incase it will help give me advice. Thanks

  if (!Page.IsPostBack)
{

this.redirecturl = Request.UrlReferrer.ToString();
}

}

public string redirecturl
{

get { return ViewState["redirecturl"].ToString(); }
set { ViewState["redirecturl"] = value; }
}


protected void btnLogin_Click(object sender, EventArgs e) ...