gistfile1.cs

public class MyViewController : UIViewController {

	public override void ViewDidLoad ()
	{
		base.ViewDidLoad ();
		for (int i = 0; i < Int32.MaxValue; i++) {
			DoStuffAsync();
		}
	}

	public void DoStuffAsync() {
		Task.Factory.StartNew<string> (() => {
			
			using (var client = new WebClient()) {
				var response = client.DownloadString (new Uri ("http://www.google.com"));
				return response;
			}

		}).ContinueWith ((t) => {
			Console.WriteLine(t);
			this.DoSomethingElse();
		});;
	}

	public void DoStuffAsyncWeak() {

		var weakViewController = new WeakReference (this);

		Task.Factory.StartNew<string> (() => {
			
			using (var client = new WebClient()) {
				var response = client.DownloadString (new Uri ("http://www.google.com"));
				return response;
			}
			
		}).ContinueWith ((t) => {
			Console.WriteLine(t);

			var strongViewController = weakViewController.Target as MyViewController;
			if (strongViewController == null)
				return;
			strongViewController.DoSomethingElse();
		});;
	}

	public void DoSomethingElse() {
		Console.WriteLine ("I'm doing something else now...");
	}
}