public:
  DWORD ThreadProcer()//Thread 
   {
      while(1){
      Sleep(1300);
      if(progress->Value <= (progress->Maximum - pg->value))
      pg->value2 += (pg->value);
      else if(progress->Value >= (progress->Maximum - pg->value))
      pg->value2 = 100;
      if(progress2->Value <= (progress2->Maximum - even_attuale->value))
      even_attuale->value2 += (even_attuale->value);
      else if(progress2->Value >= (progress2->Maximum - even_attuale->value))
      even_attuale->value2 = 100;
      progress->Value = pg->value2;
      progress2->Value = even_attuale->value2;
    }
                        return NULL;
   }
//progress e progress2 sono progressBar invece pg e even_attuale sono due oggetti di una classe creata da me

public: System::Void FormSecondario_Load(System::Object^  sender, System::EventArgs^  e) {
       HANDLE hThread;
       DWORD dwID;
       hThread =  CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)ThreadProcer(),0,0,&dwID)
                //Altra porzione di codice inutile...
}