c# - Hanging when process WaitForExit in for loop -

i creating gui application using visual c# 2010 (.net framework 3.5). how change code no stops responding?

for (int = listbox1.items.count - 1; >= 0; i--) {     listbox1.selectedindex = i;     process myprocess = new process();     myprocess.startinfo.filename = "ffmpeg.exe";     myprocess.startinfo.workingdirectory = "";     myprocess.startinfo.arguments = " -i \"" + listbox1.selecteditem + "\" " + "-y ";     myprocess.startinfo.createnowindow = true;     myprocess.startinfo.windowstyle = processwindowstyle.hidden;     myprocess.start();     myprocess.waitforexit();     listbox1.items.removeat(i); } 

the convert program time use converting. how show new form or messengebox running application? want respond window. history loop: how do loop through items in list box , remove item?

waitforexit, unsurprisingly, block thread until process has exited.
alternatively, can use exited event notified when process has exited.

you need set enableraisingevents property true in order exited event fired.

myprocess.enabledraisingevents = true; myprocess.exited += new eventhandler(myprocess_exited); myprocess.start();  void myprocess_exited(object sender, eventargs e) {     //process has exited, implement logic here     listbox1.items.remove... }