multithreading - Starting and Stopping loop from thread c# -

so big deal need solve. have visual c# application. in application users enter data , click execute. when click execute core method starts in new thread, in thread , method 1 loop. using method invoker sending updates userform loop doing. e.g. updating progressbar in every cicle.

progressbar1.invoke((methodinvoker) delegate { progressbar1.value += 1; });

i got requirement add button in userform stops loop in thread , shows has been done yet. not quiting application not stopping processes or ever need jump thread , stop loop.

i thinking add public class public methods called stop_loop.cs. hoping when start program or execute core method in new thread jump class , set cancel = false, , if click on stop button jump class , set cancel true. in end @ beggining of every cicle in loop in thread check if cancel true. if is, stop loop , move end of execution.

like this. unfortunately cannot seem access class core function. not visual studio offering me option. how can ?

namespace textboxes {     public class stop_loop     {         public bool is_canceled;          public void set_canceled(bool state)         {             this.is_canceled = state;         }         public bool get_canceled()         {             return this.is_canceled;         }     } } 

you should use cancellationtoken. here sample calculating factorial:

static void main(string[] args) {     cancellationtokensource canceltokensource = new cancellationtokensource();     cancellationtoken token = canceltokensource.token;      task task1 = new task(async () => await factorial(5, token));     task1.start();      console.writeline("type y break loop:");     string s = console.readline();     if (s == "y")         canceltokensource.cancel();      console.readline(); }  static async task factorial(int x, cancellationtoken token) {     int result = 1;     (int = 1; <= x; i++)     {         if (token.iscancellationrequested)         {             console.writeline("canceled");             return;         }          result *= i;         console.writeline("factorial of {0} equals {1}", i, result);     } }