AppDelegate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Foundation;
using UIKit;

namespace Working_with_images {
	/// <summary>
	/// The UIApplicationDelegate for the application. This class is responsible for launching the
	/// User Interface of the application, as well as listening (and optionally responding) to
	/// application events from iOS.
	/// </summary>
	[Register ("AppDelegate")]
	public partial class AppDelegate : UIApplicationDelegate {
		// class-level declarations
		UIWindow window;

		// Added controller. As of MonoTouch 5.0.2, applications are expected to
		// have a root view controller at the end of application launch

		UIViewController controller;
		UILabel label;

		/// <summary>
		/// This method is invoked when the application has loaded and is ready to run. In this
		/// method you should instantiate the window, load the UI into it and then make the window
		/// visible.
		/// </summary>
		/// <remarks>
		/// You have 5 seconds to return from this method, or iOS will terminate your application.
		/// </remarks>
		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
		{
			// create a new window instance based on the screen size
			window = new UIWindow (UIScreen.MainScreen.Bounds);

			controller = new UIViewController ();
			controller.View.BackgroundColor = UIColor.White;

			label = new UILabel ();
			label.Frame = new CoreGraphics.CGRect (10, 10, UIScreen.MainScreen.Bounds.Width, 50);
			label.Text = "Hello, Working with Images";

			controller.View.AddSubview (label);

			window.RootViewController = controller;

			// make the window visible
			window.MakeKeyAndVisible ();

			return true;
		}
	}
}