CreateLinkedTokenSource

program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;

public class Program
{
  public static void Main()
  {
      var cs1= new CancellationTokenSource ();
      var cs2= new CancellationTokenSource ();
      var cs3= CancellationTokenSource.CreateLinkedTokenSource(cs1.Token, cs2.Token);
      Console.WriteLine($"cs1.IsCancellationRequested {cs1.IsCancellationRequested}");
      Console.WriteLine($"cs2.IsCancellationRequested {cs2.IsCancellationRequested}");
      Console.WriteLine($"cs3.IsCancellationRequested {cs3.IsCancellationRequested}");
      cs3.Cancel();
      Console.WriteLine($"cs1.IsCancellationRequested {cs1.IsCancellationRequested}");
      Console.WriteLine($"cs2.IsCancellationRequested {cs2.IsCancellationRequested}");
      Console.WriteLine($"cs3.IsCancellationRequested {cs3.IsCancellationRequested}");
  }
}