// Load listboxes with data private void LoadBoxes() { Clear(); List <Member> allMembers = MemberHelper.GetAllMembers(); if (allMembers != null) { foreach (Member m in allMembers) { lstMembers.Items.Add($"{m.MemberID}, " + $"{m.Username}, " + $"{m.LastName}, " + $"{m.FirstName}, " + $"Admin: " + $"{m.IsAdmin}"); } } List <Book> allBooks = LibraryHelper.GetAllBooks(); if (allBooks != null) { foreach (Book b in allBooks) { lstBooks.Items.Add($"{b.ISBN}, " + $"{b.Title}, " + $"{b.Author}, " + $"{b.PubDate}, " + $"{b.Category}"); } } }