multithreading - Threading & Cross Threading in C#.NET, How do I change ComboBox Data from another Thread? -

i need use threading in app, don't know how perform cross threading operation.

i want able change text of form object (in case combo box), thread, error:

cross-thread operation not valid: control 'titlescombobox' accessed thread other thread created on. 

i don't understand how use invoke , begin invoke functions, im looking dead simple example , explanation can learn around that.

also beginner tutorials great, found few, different, don't understand need perform cross threading ops.

here code:

    // main thread. on click of refresh button     private void refreshbutton_click(object sender, eventargs e)     {         titlescombobox.items.clear();         thread t1 = new thread(updatecombo);         t1.start();     }      // function updates combo box rssdata     private void updatecombo()     {         rssdata = getrssdata(channeltextbox.text);       // getting data         (int = 0; < rssdata.getlength(0); i++)   // output         {              if (rssdata[i, 0] != null)             {                // cross-thread operation not valid: control 'titlescombobox'                // accessed thread other thread created on.                titlescombobox.items.add(rssdata[i, 0]);   // here error              }             titlescombobox.selectedindex = 0;         }     } 

i use following helper class:

public static class controlextensions {     public static void invoke(this control control, action action)     {         if (control.invokerequired)         {             control.invoke(new methodinvoker(action), null);         }         else         {             action.invoke();         }     } } 

now can call mycombo.invoke(() => { mycombo.items.add(something); }) --- or other control (such form) before invoke since created on main thread.

the thing controls can accessed thread created on (the main application thread in case).

hth