<form method="post">
          First name:<br>
          <input type="text" name="firstname" autocomplete="on" maxlength="10" required><br>
          Last name:<br>
          <input type="text" name="lastname" autocomplete="on" maxlength="10" required><br>
          Employee number:<br>
          <input type="text" name="empnum" maxlength="10">
          <br>
          <br>I agree to the terms above:<br>
          <input type="checkbox" name="check" required>
          <button type="submit"  asp-page-handler="SubmitAndRedirect">Submit and Redirect</button>
      </form>

public ActionResult OnPostSubmitAndRedirect()
{

    //Capture Form Data and Push to SQL DB
    var firstname = Request.Form["firstname"];
    var lastname = Request.Form["lastname"];
    var empnum = Request.Form["empnum"];

    bool isValidUser = ValidateUser(empnum, lastname);

    if (isValidUser == true)
    {
        WriteToDB(firstname, lastname, empnum, url);
        return Redirect(hardcoded);
    }
    else
    {
        return Redirect("/sign");
    }

}