c# - Run multiple winform instance sequentially -

i have c# winform application needs run multiple instance in synchronous way. goal to:

if exe runs 3 times, runs first instance of exe , rest wait until first instance finishes processing. then, next waiting exe intance run , process , on.

the exe run 1 one until finish processing exe terminates automatically af.

any idea how this?

i tried below:

    private void checkinstance()             {                 bool _returnvalue = true;                 string _lockfile = string.empty;                 random _rnd = new random();                  int _randomvalue = _rnd.next(100, 200);                 int _rndmilisec = 0;                  _rndmilisec = datetime.now.millisecond * _rnd.next(2, 6);                  _lockfile = string.concat(appdomain.currentdomain.basedirectory, string.format("/{0}", instancefilename));                  while (_returnvalue)                 {                     _returnvalue = file.exists(_lockfile);                      if (_returnvalue)                     {                         thread.sleep(1000);                         this.hide();                     }                     else                     {                         try                         {                             thread.sleep((_rnd.next(1000) + _rndmilisec) + _rnd.next(1000, 1500));                             functions.writelog(_lockfile, "starting process...");                             functions.writelog(_lockfile, string.format("start time : {0}", paramprinttime));                             file.setattributes(_lockfile, fileattributes.readonly);                             this.show();                             break;                         }                         catch (exception)                         {                             _returnvalue = false;                         }                     }                 }             }              private void deleteinstance()             {                 try                 {                     file.setattributes(string.concat(appdomain.currentdomain.basedirectory, string.format("/{0}", instancefilename)), fileattributes.normal);                     file.delete(string.concat(appdomain.currentdomain.basedirectory, string.format("/{0}", instancefilename)));                 }                 catch (exception)                 {                  }              }  private void form_shown(object sender, eventargs e)         {             _backworker.runworkerasync();         } private void formclosed(object sender, formclosedeventargs e)         {             deleteinstance();         }          private void form_load(object sender, system.eventargs e)         {             checkinstance();         }          backgroundworker _backworker = new backgroundworker(); public form()         {             initializecomponent();             _backworker.workerreportsprogress = true;             _backworker.progresschanged += _backworker_progresschanged;             _backworker.runworkercompleted += _backworker_runworkercompleted;             _backworker.dowork += _backworker_dowork;         }  private void _backworker_dowork(object sender, doworkeventargs e)         { work processing... }   private void _backworker_runworkercompleted(object sender, runworkercompletedeventargs e)         {             this.close();         }   private void _backworker_progresschanged(object sender, progresschangedeventargs e)         {             pg.value = e.progresspercentage;             lblindicator.text = e.userstate.tostring();         } 

when exe run 3 instance, first instance run while 2nd , third hides while awaiting 1st instance finisih. however, after 1st instance finish process, 2nd , 3rd instance running simultaneously.

any ideas? thanks.

maybe can work:

public static bool isprogramrunning(string titleofyourform) {     bool result = false;     process[] processes = process.getprocesses();     foreach (process p in processes)     {          if (p.mainwindowtitle.contains(titleofyourform))          {              result = true;              break;          }     }     return result; } 

call function in main function(before opening mainform), if false application.exit() else show form.. if answer helped you, vote me.