c# - How to preserve System.Threading.Timer when function is call again -

i doing simple system.threading.timer testing because want use in window services . problem facing when call again function timer , existing running time gone , how preserve ?

class file : -

namespace worker {  public class processingwork  {     public void testtimer()     {         datatable workcheck = getnewwork(); // new work database if there         foreach (datarow dr in workcheck.rows)         {             if (dr["isnew"] == "true")             {                                    timer jobtimer = new timer(timer =>                 {                     try                     {                         console.writeline("id " + convert.toint32(dr["workid"]).tostring());                         int workid = convert.toint32(dr["workid"]);                          if (workid != 0)                         {                             console.writeline(datetime.now + " | running " + workid);                             ((timer)timer).change(timespan.fromseconds(2), timespan.fromseconds(999));                         }                                            }                     catch (exception ex)                     {                         //log                     }                 });                 jobtimer.change(0, 0);             }         }     }  } } 

program main : -

class program  {     static void main(string[] args)     {         thread[] workerthread = new thread[1];         processingwork pw = new processingwork();                     workerthread[0] = new thread(() =>         {             int = 0;             while (true)             {                 console.writeline("running " + i);                 pw.testtimer();                 thread.sleep(10000);                 i++;             }         })         {             name = "test"         };         workerthread[0].start(); } 

my objective of code allow each time keep on repeat. when call again function thread run , call pw.testimer() check on database new work need process . if there create timer work .

problem facing when call again pw.testtimer(); running timer stop , gone . try without re-call pw.testtimer(); time run every 2 second have set .

what need create timer should continue run , , when there new work , add on timer .

the problem not because of timer behaviour , problem because of whenever workcheck table got edit , timer created before not able reference value , therefore timer abort.

e.g in running timer convert.toint32(dr["workid"]); //value 1 , because update table datatable workcheck = getnewwork(); when there no new data come row empty, rewrite table, first timer referencing value 1 , value 0. therefore causes running timer abort.

i fixed deep cloning workcheck , timer should reference cloning table

from

foreach (datarow dr in gjoblist.rows)

to

 foreach (datarow dr in gjoblist.deepclone().rows) 

thanks helping .