Capgemini Interview Question

1.Why connectionstring is placed in web config file. 2.how to avoid database concurrency 3.What is difference betn server.transfer & request.redirect 4.What is mac error 5.what id dbobject 6.why only properties are declare in entity class & not variables 7.What is most challenging task faced by you till date 8.can we store enity in viewstate. 9.What is memory leak 10.What is using.