private async void buttonGetId_Click(object sender, EventArgs e)
{
var book = await BookApi.Get(Convert.ToInt32(textBoxGetId.Text));
listBoxGetId.Items.Clear();
listBoxGetId.Items.Add(book);
}
private async void buttonGet_Click(object sender, EventArgs e)
{
var books = await BookApi.Get();
listBoxGet.Items.Clear();
foreach (var item in books)
{
listBoxGet.Items.Add(item);
}
}