C#

private void button2_Click(object sender, EventArgs e)
        {
            var before = System.Diagnostics.Process.GetCurrentProcess().VirtualMemorySize64;

            List<string> lst1 = new List<string>();

            for (int i = 0; i <= 1000000; i++)
            {
                lst1.Add("Test Test Test Test Test Test Test Test Test Test Test Test Test Test Test ");
            }

            var after = System.Diagnostics.Process.GetCurrentProcess().VirtualMemorySize64;

            lst1.Clear();
            lst1.TrimExcess();

            var current = System.Diagnostics.Process.GetCurrentProcess().VirtualMemorySize64;
        }

try
            {
                Random rand = new Random();
                await Task.Delay(rand.Next(300, 1000));     //sims clicks
                var webcontent = await task.Crawl().Timeout(timeout);
            }
            catch (CrawlerTimeoutException)
            {
               //do something
               
            }
            catch (Exception exp)
            {
               //do something
            }

CrawlerTimeoutException

task.Crawl().Timeout(timeout);

public static Task<T> Timeout<T>(this Task<T> task, int millisecondsTimeout)
        {
            return Task.Factory.StartNew(() =>
            {
                bool succ = task.Wait(millisecondsTimeout);
                if (succ)
                    return task.Result;
                else
                    throw new CrawlerTimeoutException("Task timeout");//here is the error
            });
        }