Defining a Label control

As a simple example, let's look at the following snippet of a XAML document:

<Label Text="Hello World!" />

When the XAML parser encounters this snippet, it creates an instance of a Label object and then sets the properties of the object that correspond to the attributes in the XAML. This means that if we set a Text property in XAML, it sets the Text property on the instance of the Label object that is created. The XAML in the preceding example has the same effect as the following:

var obj = new Label()
{
    Text = "Hello World!"
};

XAML exists to make it easier to view the object hierarchy that we need to create in order to make a GUI. An object model for a GUI is also hierarchical by design, so XAML supports adding child objects. We can simply add them as child nodes, as follows: 

<StackLayout>
    <Label Text="Hello World" />
    <Entry Text="Ducks are us" />
</StackLayout>

StackLayout...