winforms - C# - How to create progress bars dynamically -

i'm trying develop little program can support several uploads simultaneously. however, i'm facing problem : if have 1 file uploading, there progress bar; when put more files upload, don't know how create progress bars each file independently , how automatically add additional bars on multiple uploads. use webclient class uploadfileasync.

string file path needed uploading , uploadform form show progress bars , uploads.

edit : final code make functional

private void uploadenprogres(object sender, uploadprogresschangedeventargs e, string file, progressbar nouvelleprogressbar) {     console.writeline("{0} : {1} octet sur {2} au total. {3} % envoyés...", file, e.bytessent, e.totalbytestosend, e.progresspercentage);     nouvelleprogressbar.value = (int)((e.bytessent * 100) / e.totalbytestosend); }  private void uploadfini(object sender, uploadfilecompletedeventargs e, string file, progressbar nouvelleprogressbar, textbox nouvelletextbox, int32 hauteur) {     if ((e.cancelled) || (e.error != null))     {         console.writeline("{0} : erreur -- {1}", file, e.error);         return;     }     console.writeline("{0} : upload terminé, statut : ", file, system.text.encoding.utf8.getstring(e.result));     uploadform.controls.remove(nouvelleprogressbar);     uploadform.controls.remove(nouvelletextbox);     hauteur = 12; }  public void httpclientupload(string file) {     console.writeline("upload button.");     webclient clientupload = new webclient();     string authinfo;     authinfo = utilisateur + ":" + motdepasse;     authinfo = convert.tobase64string(encoding.default.getbytes(authinfo));     clientupload.headers["authorization"] = "basic " + authinfo;      // code http upload      this.hauteur += 22;      progressbar nouvelleprogressbar = new progressbar();     nouvelleprogressbar.size = new size(180, 20);     nouvelleprogressbar.maximum = 100;     nouvelleprogressbar.minimum = 0;     nouvelleprogressbar.location = new point(258, hauteur);     nouvelleprogressbar.visible = true;     uploadform.controls.add(nouvelleprogressbar);      textbox nouvelletextbox = new textbox();     nouvelletextbox.size = new size(180, 20);     nouvelletextbox.location = new point(70, hauteur);     nouvelletextbox.text = path.getfilename(file);     nouvelletextbox.enabled = false;     uploadform.controls.add(nouvelletextbox);      clientupload.headers.add("chemin", "/" + identifiantappareil + file.replace(@"\", "/"));     clientupload.uploadfilecompleted += new uploadfilecompletedeventhandler((sender, e) => uploadfini(sender, e, path.getfilename(file), nouvelleprogressbar, nouvelletextbox, hauteur));     clientupload.uploadprogresschanged += new uploadprogresschangedeventhandler((sender, e) => uploadenprogres(sender, e, path.getfilename(file), nouvelleprogressbar));     clientupload.uploadfileasync(new uri(urlserveur, "v1/ul"), file); } 

//create new progressbar each time start upload in code var progressbar = new progressbar()  //add form uploadform.controls.add(progressbar ); 

you'll need how group / position them