winforms - How to handle Thread was being aborted message on c#? -

i have simple win-form 2 buttons on , 1 button start , 1 stop thread.

but, when press stop button encounter error : "thread being aborted."

what wrong codes?

    thread th_modesendingworks;     private void buttonstart_click(object sender, eventargs e)     {         th_modesendingworks = new thread(new threadstart(works));         th_modesendingworks.start();     }      private void buttonstop_click(object sender, eventargs e)     {         th_modesendingworks.abort();         textbox1.appendtext("------------------");     }      private void works()     {         try         {             while (th_modesendingworks.isalive)             {                 textbox1.begininvoke((methodinvoker)delegate()                 {                     textbox1.appendtext("xxxxxxxxxxx");                     textbox1.scrolltocaret();                 });                  thread.sleep(1000);             }         }         catch (exception err)         {             textbox1.begininvoke((methodinvoker)delegate()             {                 textbox1.appendtext("err:" + err.message);                 textbox1.scrolltocaret();             });          }     } 

it's normal?

yes...as user1274820 mentioned, see thread.abort:

when method invoked on thread, system throws threadabortexception in thread abort it.