Error: foreach statement cannot operate on variables of type 'int' because 'int' does not contain a public definition for 'GetEnumerator' using Linq in ASP.Net

[WebMethod]  
        public static string search(DateTime fromdate, DateTime todate, string region)  
        {  
            try  
            {  
                string result = "";  
                Ts1 ts = new Ts1();  
                var dq = ts.griddata(fromdate, todate, region);  
                DataTable dt = new DataTable();  
  
                dt.Columns.Add("ID", typeof(int));  
                dt.Columns.Add("Owner", typeof(string));  
     
                foreach (var c in dq)  
                {  
                    dt.Rows.Add(c.ID, c.owner);  
                }  
  
                result = DataSetToJSON(dt);  
  
                return result;  
            }  
            catch (Exception)  
            {  
                throw new Exception();  
  
  
            }  
  
        }  
       
        public static string DataSetToJSON(DataTable dt)  
        {  
  
            Dictionary<string, object> dict = new Dictionary<string, object>();  
  
            object[] arr = new object[dt.Rows.Count + 1];  
  
            for (int i = 0; i <= dt.Rows.Count - 1; i++)  
            {  
                arr[i] = dt.Rows[i].ItemArray;  
            }  
   
            dict.Add("response", arr);  
  
            JavaScriptSerializer json = new JavaScriptSerializer();  
            return json.Serialize(dict);  
              
        }