如何更改静态变量在Xamarin.Form上进行更改？

public class MyStaticClass : INotifyPropertyChanged
{
    private static string _myVariable;

    public static string MyVariable
    {
        get { return _myVariable; }
        set
        {
            if (_myVariable != value)
            {
                _myVariable = value;
                OnPropertyChanged(nameof(MyVariable));
            }
        }
    }

    public static event PropertyChangedEventHandler PropertyChanged;

    protected static void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(null, new PropertyChangedEventArgs(propertyName));
    }
}

public class MyPage : ContentPage
{
    public MyPage()
    {
        var label = new Label();
        label.SetBinding(Label.TextProperty, new Binding("MyVariable"));

        Content = new StackLayout
        {
            Children = { label }
        };
    }
}

MyStaticClass.MyVariable = "New Value";