How do I increament the value of variable on each time when user press next button ?

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C#4.0

MVC4

int id=1;
public PartialViewResult ViewQuestions()
        {
            
            string constr = ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString();
            GetQuestions getquest = new GetQuestions();
            try
            {
                SqlConnection con = new SqlConnection(constr);
                con.Open();
                SqlCommand cmd = new SqlCommand("Select q.QuestID,q.QImage,q.Question,o.FOption,o.SOption,o.TOption,o.FROption from QuestionSet as q join OptionSet as o on q.QuestID=o.QuestID where q.QuestID=@questid ", con);
                cmd.Parameters.AddWithValue("@questid", id);
                SqlDataReader dr = cmd.ExecuteReader();
                if (dr.Read())
                {
                    getquest.QuestID = dr.GetInt32(0);
                    getquest.QuestImage = dr.GetString(1);
                    getquest.Question = dr.GetString(2);
                    dr.Close();
                    SqlCommand cmd1 = new SqlCommand("Select Foption,Soption,Toption,FRoption from Optionset where QuestID=@questid ", con);
                    cmd1.Parameters.AddWithValue("@questid", id);
                    SqlDataReader dr1 = cmd1.ExecuteReader();
                    if (dr1.Read())
                    {
                        List<Options> opt = new List<Options>();
                        opt.Add(new Options { Option1 = dr1.GetString(0) });
                        opt.Add(new Options { Option1 = dr1.GetString(1) });
                        opt.Add(new Options { Option1 = dr1.GetString(2) });
                        opt.Add(new Options { Option1 = dr1.GetString(3) });
                        getquest.Options = opt;
                    }
                    dr1.Close();
                    
                    
                }


            }
            catch (Exception ex)
            {

            }
            return PartialView(getquest);
        }
        [HttpPost]
        public RedirectToRouteResult Forward()
        {
            
            int ID = Convert.ToInt32(Request.Form["QuestID"]);
            id = ID + 1;
            
            
            return RedirectToAction("ViewQuestions");
        }

What I have tried:

I try to update the value of id each time when user press the "Next" button from view page . I assign the post method "Forward" for that?

Thanks in advance.