Asp.net mvc Forms Authentication Prevent user from been automatically logged when created

Question

Asp.net mvc 4 application, with Forms Authentication, I have a admin role who adds users to the application, but when I create a new user it automatically logs the new created user in, how can i prevent this?

here's my register action in the account controller

      [HttpPost]
    public ActionResult Register(string username, string password)
    {
        WebSecurity.CreateUserAndAccount(username, password);
        Roles.AddUserToRole(username, "Mechanic");
        FormsAuthentication.SetAuthCookie(username, false);
        return new HttpStatusCodeResult(HttpStatusCode.OK); 
    }

Answer 1

Try this:

 [HttpPost]
public ActionResult Register(string username, string password)
{
    WebSecurity.CreateUserAndAccount(username, password);
    Roles.AddUserToRole(username, "Mechanic");

    return new HttpStatusCodeResult(HttpStatusCode.OK); 
}