Placeholder for UITextView in Xamarin

gistfile1.cs

// sample text box
var descriptionField = new UITextView (new RectangleF (0, 230, UIScreen.MainScreen.Bounds.Width, 100)){
	BackgroundColor = UIColor.White,
	Text = " Description:",
	TextColor = ViewHelpers.DarkGray,
	Font = UIFont.FromName("Helvetica", 18f)
};
// some work arounds for UITextView placeholders
var Placeholder = " Description:";
descriptionField.ShouldBeginEditing = t => {
	if (descriptionField.Text == Placeholder) {
		descriptionField.Text = string.Empty;
  }	
	return true;
};
descriptionField.ShouldEndEditing = t => {
	if (string.IsNullOrEmpty (descriptionField.Text)) {
		descriptionField.Text = Placeholder;
	}
	return true;
};