// Delete book
public string DeleteBook(string bookId)
{
if (!String.IsNullOrEmpty(bookId))
{
try
{
int _bookId = Int32.Parse(bookId);
using (BookDBContext contextObj = new BookDBContext())
{
var _book = contextObj.book.Find(_bookId);
contextObj.book.Remove(_book);
contextObj.SaveChanges();
return "Selected book record deleted sucessfully";
}
}
catch (Exception)
{
return "Book details not found";
}
}
else
{
return "Invalid operation";
}
}
// Add book
public string AddBook(Book book)
{
if (book != null)
{
using (BookDBContext contextObj = new BookDBContext())
{
contextObj.book.Add(book);
contextObj.SaveChanges();
return "Book record added successfully";
}
}
else
{
return "Invalid book record";
}
}
//Update Book
public string UpdateBook(Book book)
{
if (book != null)
{
using (BookDBContext contextObj = new BookDBContext())
{
int bookId = Convert.ToInt32(book.Id);
Book _book = contextObj.book.Where(b => b.Id == bookId).FirstOrDefault();
_book.Title = book.Title;
_book.Author = book.Author;
_book.Publisher = book.Publisher;
_book.Isbn = book.Isbn;
contextObj.SaveChanges();
return "Book record updated successfully";
}
}
else
{
return "Invalid book record";
}
}
