How to stop System.Threading.Timer in callback method

Try this:

If you want you could let timer continue firing the callback method and include the code below

private void CreatorLoop(object state)  
 { 
   if (Monitor.TryEnter(lockObject) 
   { 
     try 
     { 
       // Work here 
     } 
     finally 
     { 
       Monitor.Exit(lockObject); 
     } 
   } 
 } 

check out this link too:

Stopping timer in its callback method