c# - How to pause for loop when pause button is clicked? -

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when run program , try click pause button, nothing happens. not sure how can work exactly. have bool variable called pause , pause set false. once pause button clicked should set variable true. loop checks , should display message user. appreciated!

namespace practice2  {    public partial class form1 : form   {     photocopier printer = new photocopier(500, 2500);     bool pause = false;     public form1()     {         initializecomponent();     }      private void form1_load(object sender, eventargs e)     {      }      private void btnstart_click(object sender, eventargs e)     {          if (checktext(txtnumbercopies.text) == true)         {             int numbercopies = convert.toint32(txtnumbercopies.text);             int toner = convert.toint32(lbltoneramount.text);             int papercapacity = convert.toint32(lblpaperamount.text);              if (toner <= 625 && papercapacity <= 125)             {                 txtmessage.text = "printer low on toner , paper!";             }             else if (toner <= 625){                 txtmessage.text = "printer toner low!";             }             else if (papercapacity <= 125)             {                 txtmessage.text = "printer paper low!";             }             else             {                 txtmessage.text = "printing...";                 txtmessage.refresh();                 (int = numbercopies; != 0; i--)                 {                     int paper = convert.toint32(lblpaperamount.text);                     paper--;                     if (paper == 480 || paper == 380 || paper == 400 || paper == 200)                     {                         messagebox.show("there paper jam! please remove jam , hit ok button continue!", "important message", messageboxbuttons.ok, messageboxicon.exclamation);                      }                      if (pause == true)                     {                         messagebox.show("press ok button when ready continue", "important message", messageboxbuttons.ok, messageboxicon.exclamation);                     }                     lblpaperamount.text = convert.tostring(convert.toint32(lblpaperamount.text) - 1);                     lbltoneramount.text = convert.tostring(convert.toint32(lbltoneramount.text) - 1);                     thread.sleep(1000);                 }                 txtmessage.text = "job completed!";             }          }     }      private void btnaddpaper_click(object sender, eventargs e)     {         int paperamount = convert.toint32(lblpaperamount.text);         if (checktext(txtaddpaper.text) == true && paperamount <= 500)         {             lblpaperamount.text = convert.tostring(paperamount + convert.toint32(txtaddpaper.text));         }         else         {             txtmessage.text = "printer paper @ capacity!";         }     }      private bool checktext(string textbox)     {         if (textbox.equals("") || textbox == null)         {             txtmessage.text = "please enter value in text box!";             return false;         }         return true;     }      private void btnreplacetoner_click(object sender, eventargs e)     {         lbltoneramount.text = convert.tostring(printer.toner);     }      private void btnpausecancel_click(object sender, eventargs e)     {         pause = true;      } } }

the problem you're doing work on ui thread, ui thread busy , can't process messages (e.g. button click). need work on worker thread instead, using backgroundworker or task.run instance.


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