Question d’entretien chez Cleverbit Software

.NET / DB -"Using" Statement, -Things to check when Concatenating String (null, overflow..) -Difference between POST and GET - Can you make an insert with a GET? - What are indexes? Advantages and disadvantages - What is AJAX? 2 open questions: - I have a system when I use Barcods and QR codes for my products. How would I build the architecture model and logic? - I have a website and I want to constantly see how many customers are looking at the specific product. How would I do that?