Text Field Validation for UITextField in Xamarin

gistfile1.cs

// sample text field
var titleField = new UITextField (new RectangleF (0, 160, UIScreen.MainScreen.Bounds.Width, 50)){
	BackgroundColor = UIColor.White,
	TextColor = ViewHelpers.DarkGray,
	Placeholder = "Title:"
};
// validation
titleField.EditingDidEnd += (object sender, EventArgs e) => {
	if ( ((UITextField)sender).Text.Length <= 0 ) {
		InvokeOnMainThread ( () => {
			titleField.Layer.BorderColor = ViewHelpers.DarkBlue.CGColor;
			titleField.Layer.BorderWidth = 2;
			titleField.Text = "Please fill in the Title:";
	} );
	}else if ( ((UITextField)sender).Text.Length > 0 ){
			titleField.Layer.BorderColor = ViewHelpers.DarkBlue.CGColor;
			titleField.Layer.BorderWidth = 0;
		}
};