if (rememberMe)
{

Response.Cookies.Clear();
DateTime expiryDate = DateTime.Now.AddDays(30);
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(2, loginModel.UserName, DateTime.Now, expiryDate, true, String.Empty);

string encryptedTicket = FormsAuthentication.Encrypt(ticket);
HttpCookie authenticationCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket);
authenticationCookie.Expires = ticket.Expiration;
Response.Cookies.Add(authenticationCookie);
}