Within Xamarin Studio, navigate to File | New | Solution….

Choose the C# | iOS | iPhone group.

Choose the Single View Application project type.

Name your project HelloiPhone and click OK.

Open the HelloiPhoneViewController.cs file.

We'll explore some code examples in detail later, but for now just replace the ViewDidLoad() method with the following block of code:

UILabellabelHello;
public override void ViewDidLoad ()
        {
base.ViewDidLoad ();
var frame = new RectangleF(10, 10, 300, 30);
labelHello = new UILabel(frame);
labelHello.Text = "Hello, iPhone!";
View.Add (labelHello);
        }

In the target dropdown, select iPhone Retina (4-inch) -> iOS 7.1.

Click the Build and Run button.