How Do I Use Query String To Restrict Url Entering In Mvc

[HttpPost]
[AllowAnonymous]
[Authorize(Roles = "Admin")]
[ValidateAntiForgeryToken]
public async Task<ActionResult> ResetPassword(ResetPasswordViewModel model)
{
    if (!ModelState.IsValid)
    {
        return View(model);
    }
    RegisterBusiness reg = new RegisterBusiness();
    ApplicationUser user = new ApplicationUser();
    user = reg.UserManager.FindByEmail(model.Email);
    if (user == null)
    {
        ModelState.AddModelError("", "No user found.");
        return View();
    }
    IdentityResult result = await UserManager.ResetPasswordAsync(user.Id, model.Code, model.Password);
    if (result.Succeeded)
    {
        return RedirectToAction("ResetPasswordConfirmation", "Account");
    }
    AddErrors(result);
    return View();
}