Compare 2 arrayes and make 3 arrays with comma separted val

          
                if (base.Request.Form["apptToList1"] != null)
                {
                    string[] Get_delval = base.Request.Form["apptToList1"].Split(',');

                    for (Int32 i = 0; i <= numArray.Length - 1; i++)
                    {
                        for (Int32 j = 0; j <= Get_delval.Length - 1; j++)
                        {
                            if (numArray[i].ToString() == Get_delval[j].ToString())
                            {
                                break; 
                            }
                            else
                            {
                                if (j == Get_delval.Length - 1)
                                {
                                    list1.Add(numArray[i].ToString());
                                }
                            }
                        }
                    }