ios-samples/MonoCatalogSample/searchbar.cs

//
// C# port of the searchbar sample
//
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using System.Drawing;

public partial class SearchBarController : UIViewController {
	UISearchBar bar;

	class SearchDelegate : UISearchBarDelegate {
		public override void SearchButtonClicked (UISearchBar bar)
		{
			bar.ResignFirstResponder ();
		}

		public override void CancelButtonClicked (UISearchBar bar)
		{
			bar.ResignFirstResponder ();
		}
	}

	public override void ViewDidLoad ()
	{
		base.ViewDidLoad ();

		Title = "Search Bar";
		View.BackgroundColor = UIColor.GroupTableViewBackgroundColor;
		var f = new RectangleF (0f, 0f, View.Bounds.Width, 44f);
		bar = new UISearchBar (f){
			Delegate = new SearchDelegate (),
			ShowsCancelButton = true,
		};
		View.AddSubview (bar);
	}

}