public async void CheckOutBook()
{
if (!PerformCheckOutValidation())
{
DisplayErrorMessage(BookCheckOutConditionError);
return;
}
var transaction = new BookTransaction
{
Customer = new Customer
{
CustomerId = SuppliedCustomerId
},
Book = new Book
{
BookId = SelectedBook.BookId
},
CheckOut = DateTime.Now
};
bool success = await bookManager.CheckOutBook(transaction).ConfigureAwait(false);
SuppliedCustomerId = 0;
OnPropertyChanged("SuppliedCustomerId");
if (success)
{
--SelectedBook.AvailableCopies;
CollectionViewSource.GetDefaultView(this.Books).Refresh();
DisplayInfoMessage(BookCheckOutSuccess, "Success!");
}
else
{
DisplayErrorMessage(BookCheckOutError);
}
}