protected void btnAdd_Click(object sender, EventArgs e) { LibrarayManagementSystemEntities1 libEntity = new LibrarayManagementSystemEntities1(); tbl_book book = new tbl_book(); book.BookName = txtBookName.Text; book.Author = txtAuthor.Text; book.Publication = txtPublication.Text; book.Subject = txtSubject.Text; book.NoOfCopies = Convert.ToInt32(txtQuantity.Text); libEntity.AddTotbl_book(book); libEntity.SaveChanges(); lblMessage.Text = "Book Add Successfulyl !"; }