ViewController.cs

public partial class ViewController : UIViewController, IUIPickerViewDataSource
{
	protected ViewController (IntPtr handle) : base (handle)
	{
		// Note: this .ctor should not contain any initialization logic.
	}

	public override void ViewDidLoad ()
	{
		base.ViewDidLoad ();
		// Perform any additional setup after loading the view, typically from a nib.

		var view = new UIPickerView ();
		view.Model = new UIPickerViewModel ();
		view.DataSource = this;
		Add (view);
	}

	public override void DidReceiveMemoryWarning ()
	{
		base.DidReceiveMemoryWarning ();
		// Release any cached data, images, etc that aren't in use.
	}

	public nint GetComponentCount (UIPickerView pickerView)
	{
		return 1;
	}

	public nint GetRowsInComponent (UIPickerView pickerView, nint component)
	{
		return 5;
	}
}