Every programming language use a property for the controls which is unique in the controls collection so that we will be able to reference it. In XAML we use the x:Name attribute name in order to give a unique name to a control.
<Label x:Name="MyLabel" Text="Hello World!" />
Now we can use in the code-behind file the nameĀ MyLabel in order to access the Label control.
MyLabel.Text = "Hello World!";