I need help to create a login form in web API

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C#

Javascript

jQuery

web

API

Hello
I need to create a Secure login form in Web API and I do NOT want to pass the Login values via URL to redirect page.My problem is :
I can check weather the Username and Password is correct (exist in SQL DB), but I don't know how to pass values to redirected page (Home.html) so User can redirect to him/her own Home page with his personal info.

What I have tried:

Controller:

public class LoginAuthenticateArgs
{
  public string Username {get; set;}
  public string Password {get; set;}
}


[HttpPost]
public int LoginAuthenticate(LoginAuthenticateArgs _Login)
{
  using(Product _Product = new Product())
  {
    var _UserLogin = _Product.Login
                              .where(c=>c.Username == _Login.Username &&
                                        c.Password == _Login.Password)
                               .singleordefault();
    if(_UserLogin != null)
    {
       return _UserLogin .ID;
    }
  }
}

JavaScript:

function LoginClick(){
 var data = {
   Username: $("#UsernameTextbox").val(),
   Password: $("#PasswordTextbox").val()
 };
 Ajax("Controller/function", data, Success, Fail, "post"};
};

function Success(response){
  // I don't know what to do now and how to pass the response
  // to redirect page
};