//DELETE THE RETURN BOOK =>PL
 private void BtnAccept_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         ReturnedBook returned = dgReturn.SelectedItem as ReturnedBook;
         if (returned != null)
         {
             UserReturnBL userReturnBL = new UserReturnBL();
             bool         isDone1      = userReturnBL.DeleteReturnBL(returned.BookId, returned.UserId);
             BookBL       bookBL       = new BookBL();
             bool         isDone2      = bookBL.IncBookCopyBL(returned.BookId);
             if (isDone1 == true && isDone2 == true)
             {
                 MessageBox.Show("Book taken back successfully...");
                 InitializeAdminReturn();
             }
             else
             {
                 MessageBox.Show("Try again...");
             }
         }
     }
     catch (Exception)
     {
         MessageBox.Show("Some unknown exception is occured!!!, Try again..");
     }
 }