GetAuthCookie and SetAuthCookie

Hi,
I Need to Authenticate a User by using FormsAuthentication.SetAuthCookie and Check User is Authenticated in Another page Load How to Do this anyone?

Login Page


if (txtuname.Text == "mike")
        {
            FormsAuthentication.SetAuthCookie("mike", true);
             Response.Redirect(FormsAuthentication.DefaultUrl);
}
Welcome Page
PageLoad()
{
}







...