multithreading - About threads in c# -

i have button click contains ten methods. here want use threads in button click or in code windows form application not hang.

this have tried far...!!

                collectlistofptags();                  reqdoccheck = new thread(new threadstart(collectlistofptags));                  reqdoccheck.isbackground = true;                  reqdoccheck.start();                  waithandle[] await = new waithandle[] { new autoresetevent(false) };                 while (reqdoccheck.isalive)                 {                     waithandle.waitany(await, 50, false);                     system.windows.forms.application.doevents();                 }  

in method collectionlistofptags() getting exception says "a combobox accessed thread other created on"

thank's patience.. appreciated..

this looks fit backgroundworker component.

split collectlistofptags method 2 methods - first collects , processes data , second updates ui controls.

something this:

void onclick( ... ) {   var results = new list<string>();    var bw = new backgroundworker();    bw.dowork += ( s, e ) => collectdata( results );   bw.runworkercompleted += ( s, e ) => updateui( results );    bw.runworkerasync(); }  void collectdata( list<string> results ) {   ... build strings , add them results list }  void updateui( list<string> results ) {   ... update combobox results } 

the backgroundworker run collectdata in background on thread pool thread, run updateui on ui thread can access combobox correctly.