Viewmodel is created twice - asp.net-mvc-5

Question

I pass an instance of LoginViewModel to my view (Login)
When I click the submit button on the form another instance of LoginViewModel is created.
I can observe this because I put a breakpoint in the constructor.
Why does this happen and how can I fix it?
#using ViewModels
#model LoginViewModel
<form action="~/Home/VerifyLogin" method="post">
<table>
<tr>
<td>
User Name:
</td>
<td>
#Html.DropDownListFor(m => m.SelectedUserID, Model.UserList);
</td>
</tr>
<tr>
<td>
Password:
</td>
<td>
#Html.TextAreaFor(m => m.SelectedPassword);
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value ="Login" />
</td>
</tr>
</table>
</form>
Controller
public class HomeController : Controller
{
//
// GET: /Home/
public ActionResult Index()
{
return View();
}
public ActionResult RedirectToLogin()
{
return View("Login", new LoginViewModel());
}
[HttpPost]
public void VerifyLogin(LoginViewModel vm)
{
bool sucess = false;
// some logic
if(sucess)
RedirectToAction("ProjectList", "Project");
}
ViewModel
public class LoginViewModel :BaseViewModel
{
public IEnumerable<User> Users { get; private set; }
public IEnumerable<SelectListItem> UserList { get; private set; }
public int SelectedUserID { get; set; }
public string SelectedPassword { get; set; }
public LoginViewModel()
{
Users = DataService.GetUsers();
UserList = new SelectList(Users, "ID", "Name");
}
public bool Login(string userName, string password)
{
return true;
}
}

Answer 1

One is created here...
return View("Login", new LoginViewModel());
And one is created here
public void VerifyLogin(LoginViewModel vm)
The model binder creates objects and fills them with the parameters it receives from the request. This is normal operation.
To fix your problem, I would do this...
public ActionResult RedirectToLogin()
{
var vm = new LoginViewModel()
{
Users = DataService.GetUsers();
UserList = new SelectList(Users, "ID", "Name");
};
return View("Login", vm);
}
public LoginViewModel()
{
//Removed code
}