I am getting this error.. System.stackoverflowexception

public ActionResult View(GetUserData getUserData)
             {

                List<GetUserData> GetUserData = new List<GetUserData>();
                string DefaultConnection = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
                string query = "SELECT Email,UserName FROM AspNetUsers";
                using (SqlConnection con = new SqlConnection(DefaultConnection))
                {                   
                    using (SqlCommand cmd = new SqlCommand(query))
                    {
                        cmd.Connection = con;
                        con.Open();
                        using (SqlDataReader sdr = cmd.ExecuteReader())
                        {
                            while (sdr.Read())
                            {
                                GetUserData.Add(new GetUserData
                                {
                                    UserName = Convert.ToString(sdr["UserName"]),
                                    Email = Convert.ToString(sdr["Email"])
                                });
                            }
                        }
                    }
                    con.Close();
                }
                return View(getUserData);
             }