how to redirect page in string method(MVC)

Question

i want to redirect my page to Login Page when user clicks on logout,

how can i redirect, below is my code

 

public string LogOut(Login log)

{

   using (simpleEntities dbContext = new simpleEntities())

   {

      int ID = Convert.ToInt32(log.ID);   

      Login s_data = dbContext.Logins.Where(x => x.ID == ID).FirstOrDefault();

      log.LogoutTime = DateTime.Now;

      log.Status = 0;

      dbContext.SaveChanges();

      FormsAuthentication.SignOut();

      Session.Abandon();

      Session.Clear();

      Response.Cookies.Clear();

      Session.RemoveAll();

   }

   return RedirectToAction("Login", "Login");

}

 

 

i tried using  return RedirectToAction("Login", "Login");  but it shows me error....

can anyone help me to solve this out..