Adding methods to update the GUI and respond to events

We need some code to update the GUI and to keep track of the count. Proceed as follows:

1. Open MainPage.xaml.cs.
2. Add the following code to the class: 

private int _likeCount;
private int _denyCount;

private void UpdateGui()
{
    likeLabel.Text = _likeCount.ToString();
    denyLabel.Text = _denyCount.ToString();
}
 
private void Handle_OnLike(object sender, EventArgs e)
{
    _likeCount++;
    InsertPhoto();
    UpdateGui();
}

private void Handle_OnDeny(object sender, EventArgs e)
{
    _denyCount++;
    InsertPhoto();
    UpdateGui();
} 

The two fields at the top of the preceding code block keep track of the number of likes and denies. Since they are value-type variables, they default to zero.

To make the changes of these labels show up in the UI, we've created a method called UpdateGui(). This takes the value of the two aforementioned fields and assigns it to the Text properties of both labels.

The two methods that follow are the event...